NIST Special Publication 800-38A: Recommendation for BlockCipher Modes of Operation

11 December 2001
Source: http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf (225KB)

[66 pages.]

NIST Special Publication 800-38A
2001 Edition

NIST
National Institute of
Standards and Technology
Technology Administration
U.S. Department of Commerce

Recommendation for Block
Cipher Modes of Operation

Methods and Techniques

Morris Dworkin

C O M P U T E R S E C U R I T Y

Computer Security Division
Information Technology Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899-8930

December 2001

U.S. Department of Commerce
Donald L. Evans, Secretary
Technology Administration
Phillip J. Bond, Under Secretary of Commerce for Technology
National Institute of Standards and Technology
Arden L. Bement, Jr., Director

Reports on Information Security Technology

The Information Technology Laboratory (ITL) at the National Institute of Standards and Technology (NIST) promotes the U.S. economy and public welfare by providing technical leadership for the Nation’s measurement and standards infrastructure. ITL develops tests, test methods, reference data, proof of concept implementations, and technical analyses to advance the development and productive use of information technology. ITL’s responsibilities include the development of technical, physical, administrative, and management standards and guidelines for the cost-effective security and privacy of sensitive unclassified information in Federal computer systems. This Special Publication 800-series reports on ITL’s research, guidance, and outreach efforts in computer security, and its collaborative activities with industry, government, and academic organizations.

Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose.

National Institute of Standards and Technology Special Publication 800-38A 2001 ED
Natl. Inst. Stand. Technol. Spec. Publ. 800-38A 2001 ED, 66 pages (December 2001)
CODEN: NSPUE2

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Abstract

This recommendation defines five confidentiality modes of operation for use with an underlying symmetric key block cipher algorithm: Electronic Codebook (ECB), Cipher Block Chaining (CBC), Cipher Feedback (CFB), Output Feedback (OFB), and Counter (CTR). Used with an underlying block cipher algorithm that is approved in a Federal Information Processing Standard (FIPS), these modes can provide cryptographic protection for sensitive, but unclassified, computer data.

KEY WORDS: Computer security; cryptography; data security; block cipher; encryption; Federal Information Processing Standard; mode of operation.

1 PURPOSE

2 AUTHORITY

3 INTRODUCTION

4 DEFINITIONS, ABBREVIATIONS, AND SYMBOLS

4.1 DEFINITIONS AND ABBREVIATIONS
4.2 SYMBOLS
4.2.1 Variables
4.2.2 Operations and Functions

5 PRELIMINARIES

5.1 UNDERLYING BLOCK CIPHER ALGORITHM
5.2 REPRESENTATION OF THE PLAINTEXT AND THE CIPHERTEXT
5.3 INITIALIZATION VECTORS
5.4 EXAMPLES OF OPERATIONS AND FUNCTIONS

6 BLOCK CIPHER MODES OF OPERATION

6.1 THE ELECTRONIC CODEBOOK MODE
6.2 THE CIPHER BLOCK CHAINING MODE
6.3 THE CIPHER FEEDBACK MODE
6.4 THE OUTPUT FEEDBACK MODE
6.5 THE COUNTER MODE

APPENDIX A: PADDING

APPENDIX B: GENERATION OF COUNTER BLOCKS

B.1 THE STANDARD INCREMENTING FUNCTION
B.2 CHOOSING INITIAL COUNTER BLOCKS

APPENDIX C: GENERATION OF INITIALIZATION VECTORS

APPENDIX D: ERROR PROPERTIES

APPENDIX E: MODES OF TRIPLE

APPENDIX F: EXAMPLE VECTORS FOR MODES OF OPERATION OF THE AES

F.1 ECB EXAMPLE VECTORS
F.1.1 ECB-AES128.Encrypt
F.1.2 ECB-AES128.Decrypt
F.1.3 ECB-AES192.Encrypt
F.1.4 ECB-AES192.Decrypt
F.1.5 ECB-AES256.Encrypt
F.1.6 ECB-AES256.Decrypt

F.2 CBC EXAMPLE
F.2.1 CBC-AES128.Encrypt
F.2.2 CBC-AES128.Decrypt
F.2.3 CBC-AES192.Encrypt
F.2.4 CBC-AES192.Decrypt
F.2.5 CBC-AES256.Encrypt
F.2.6 CBC-AES256.Decrypt

F.3 CFB EXAMPLE VECTORS
F.3.1 CFB1-AES128.Encrypt
F.3.2 CFB1-AES128.Decrypt
F.3.3 CFB1-AES192.Encrypt
F.3.4 CFB1-AES192.Decrypt
F.3.5 CFB1-AES256.Encrypt
F.3.6 CFB1-AES256.Decrypt
F.3.7 CFB8-AES128.Encrypt
F.3.8 CFB8-AES128.Decrypt
F.3.9 CFB8-AES192.Encrypt
F.3.10 CFB8-AES192.Decrypt
F.3.11 CFB8-AES256.Encrypt
F.3.12 CFB8-AES256.Decrypt
F.3.13 CFB128-AES128.Encrypt
F.3.14 CFB128-AES128.Decrypt
F.3.15 CFB128-AES192.Encrypt
F.3.16 CFB128-AES192.Decrypt
F.3.17 CFB128-AES256.Encrypt
F.3.18 CFB128-AES256.Decrypt

F.4 OFB EXAMPLE VECTORS
F.4.1 OFB-AES128.Encrypt
F.4.2 OFB-AES128.Decrypt
F.4.3 OFB-AES192.Encrypt
F.4.4 OFB-AES192.Decrypt
F.4.5 OFB-AES256.Encrypt
F.4.6 OFB-AES256.Decrypt

F.5 CTR EXAMPLE VECTORS
F.5.1 CTR-AES128.Encrypt
F.5.2 CTR-AES128.Decrypt
F.5.3 CTR-AES192.Encrypt
F.5.4 CTR-AES192.Decrypt
F.5.5 CTR-AES256.Encrypt
F.5.6 CTR-AES256.Decrypt

APPENDIX G: REFERENCES

Table of Figures

Figure 1: The ECB Mode

Figure 2: The CBC Mode

Figure 3: The CFB Mode

Figure 4: The OFB Mode

Figure 5: The CTR Mode

1 Purpose

This publication provides recommendations regarding modes of operation to be used with symmetric key block cipher algorithms.

2 Authority

This document has been developed by the National Institute of Standards and Technology (NIST) in furtherance of its statutory responsibilities under the Computer Security Act of 1987 (Public Law 100-235) and the Information Technology Management Reform Act of 1996, specifically 15 U.S.C. 278 g-3(a)(5). This is not a guideline within the meaning of 15 U.S.C. 278 g-3 (a)(5).

This recommendation is neither a standard nor a guideline, and as such, is neither mandatory nor binding on Federal agencies. Federal agencies and non-government organizations may use this recommendation on a voluntary basis. It is not subject to copyright.

Nothing in this recommendation should be taken to contradict standards and guidelines that have been made mandatory and binding upon Federal agencies by the Secretary of Commerce under his statutory authority. Nor should this recommendation be interpreted as altering or superseding the existing authorities of the Secretary of Commerce, the Director of the Office of Management and Budget, or any other Federal official.

Conformance testing for implementations of the modes of operation that are specified in this recommendation will be conducted within the framework of the Cryptographic Module Validation Program (CMVP), a joint effort of the NIST and the Communications Security Establishment of the Government of Canada. An implementation of a mode of operation must adhere to the requirements in this recommendation in order to be validated under the CMVP.

3 Introduction

This recommendation specifies five confidentiality modes of operation for symmetric key block cipher algorithms, such as the algorithm specified in FIPS Pub. 197, the Advanced Encryption Standard (AES) [2]. The modes may be used in conjunction with any symmetric key block cipher algorithm that is approved by a Federal Information Processing Standard (FIPS). The five modes—the Electronic Codebook (ECB), Cipher Block Chaining (CBC), Cipher Feedback (CFB), Output Feedback (OFB), and Counter (CTR) modes—can provide data confidentiality.

Two FIPS publications already approve confidentiality modes of operation for two particular block cipher algorithms. FIPS Pub. 81 [4] specifies the ECB, CBC, CFB, and OFB modes of the Data Encryption Standard (DES). FIPS Pub. 46-3 [3] approves the seven modes that are specified in ANSI X9.52 [1]. Four of these modes are equivalent to the ECB, CBC, CFB, and OFB modes with the Triple DES algorithm (TDEA) as the underlying block cipher; the other three modes in ANSI X9.52 are variants of the CBC, CFB, and OFB modes of Triple DES that use interleaving or pipelining.

Thus, there are three new elements in this recommendation: 1) the extension of the four confidentiality modes in FIPS Pub 81 for use with any FIPS-approved block cipher; 2) the revision of the requirements for these modes; and 3) the specification of an additional confidentiality mode, the CTR mode, for use with any FIPS-approved block cipher.

4 Definitions, Abbreviations, and Symbols

4.1 Definitions and Abbreviations

Bit A binary digit: 0 or 1.

Bit Error The substitution of a ‘0’ bit for a ‘1’ bit, or vice versa.

Bit String An ordered sequence of 0’s and 1’s.

Block Cipher A family of functions and their inverse functions that is parameterized by cryptographic keys; the functions map bit strings of a fixed length to bit strings of the same length.

Block Size The number of bits in an input (or output) block of the block cipher.

CBC Cipher Block Chaining.

CFB Cipher Feedback.

Ciphertext Encrypted data.

Confidentiality Mode A mode that is used to encipher plaintext and decipher ciphertext. The confidentiality modes in this recommendation are the ECB, CBC, CFB, OFB, and CTR modes.

CTR Counter.

Cryptographic Key A parameter used in the block cipher algorithm that determines the forward cipher operation and the inverse cipher operation.

Data Block (Block) A sequence of bits whose length is the block size of the block cipher.

Data Segment (Segment) In the CFB mode, a sequence of bits whose length is a parameter that does not exceed the block size.

Decryption (Deciphering) The process of a confidentiality mode that transforms encrypted data into the original usable data.

ECB Electronic Codebook.

Encryption (Enciphering) The process of a confidentiality mode that transforms usable data into an unreadable form.

Exclusive-OR The bitwise addition, modulo 2, of two bit strings of equal length.

FIPS Federal Information Processing Standard.

Forward Cipher Function (Forward Cipher Operation) One of the two functions of the block cipher algorithm that is selected by the cryptographic key.

Initialization Vector (IV) A data block that some modes of operation require as an additional initial input.

Input Block A data block that is an input to either the forward cipher function or the inverse cipher function of the block cipher algorithm.

Inverse Cipher Function (Inverse Cipher Operation) The function that reverses the transformation of the forward cipher function when the same cryptographic key is used.

Least Significant Bit(s) The right-most bit(s) of a bit string.

Mode of Operation (Mode) An algorithm for the cryptographic transformation of data that features a symmetric key block cipher algorithm.

Most Significant Bit(s) The left-most bit(s) of a bit string.

Nonce A value that is used only once.

Octet A group of eight binary digits.

OFB Output Feedback.

Output Block A data block that is an output of either the forward cipher function or the inverse cipher function of the block cipher algorithm.

Plaintext Usable data that is formatted as input to a mode.

4.2 Symbols

4.2.1 Variables

b The block size, in bits.

j The index to a sequence of data blocks or data segments ordered from left to right.

n The number of data blocks or data segments in the plaintext.

s The number of bits in a data segment.

u The number of bits in the last plaintext or ciphertext block.

C_j The j·^th ciphertext block.

C^#_j The j·^th ciphertext segment.

C^*_n The last block of the ciphertext, which may be a partial block.

I_j The j^·th input block.

IV The initialization vector.

K The secret key.

O_j The j^·th output block.

P_j The j^·th plaintext block.

P^#j The j^·th plaintext segment.

P^*n The last block of the plaintext, which may be a partial block.

T^j The j·^th counter block.

4.2.2 Operations and Functions

X | Y The concatenation of two bit strings X and Y.

XY The bitwise exclusive-OR of two bit strings X and Y of the same length.

CIPH_K(X) The forward cipher function of the block cipher algorithm under the key K applied to the data block X.

CIPH^-1_K(X) The inverse cipher function of the block cipher algorithm under the key K applied to the data block X.

LSB_m(X) The bit string consisting of the m least significant bits of the bit string X.

MSB_m(X) The bit string consisting of the m most significant bits of the bit string X.

[x]_m The binary representation of the non-negative integer x, in m bits, where x<2^m.

5 Preliminaries

5.1 Underlying Block Cipher Algorithm

This recommendation assumes that a FIPS-approved symmetric key block cipher algorithm has been chosen as the underlying algorithm, and that a secret, random key, denoted K, has been established among all of the parties to the communication. The cryptographic key regulates the functioning of the block cipher algorithm and, thus, by extension, regulates the functioning of the mode. The specifications of the block cipher and algorithms and the modes are public, so the security of the mode depends, at a minimum, on the secrecy of the key.

A confidentiality mode of operation of the block cipher algorithm consists of two processes that are inverses of each other: encryption and decryption. Encryption is the transformation of a usable message, called the plaintext, into an unreadable form, called the ciphertext; decryption is the transformation that recovers the plaintext from the ciphertext.

For any given key, the underlying block cipher algorithm of the mode also consists of two functions that are inverses of each other. These two functions are often called encryption and decryption, but in this recommendation, those terms are reserved for the processes of the confidentiality modes. Instead, as part of the choice of the block cipher algorithm, one of the two functions is designated as the forward cipher function, denoted CIPH_K; the other function is then called the inverse cipher function, denoted CIPH^-1_K . The inputs and outputs of both functions are called input blocks and output blocks. The input and output blocks of the block cipher algorithm have the same bit length, called the block size, denoted b.

5.2 Representation of the Plaintext and the Ciphertext

For all of the modes in this recommendation, the plaintext must be represented as a sequence of bit strings; the requirements on the lengths of the bit strings vary according to the mode:

For the ECB and CBC modes, the total number of bits in the plaintext must be a multiple of the block size, b; in other words, for some positive integer n, the total number of bits in the plaintext must be nb. The plaintext consists of a sequence of n bit strings, each with bit length b. The bit strings in the sequence are called data blocks, and the plaintext is denoted P₁ , P₂ ,…, P_n.

For the CFB mode, the total number of bits in the plaintext must be a multiple of a parameter, denoted s, that does not exceed the block size; in other words, for some positive integer n, the total number of bits in the message must be ns. The plaintext consists of a sequence of n bit strings, each with bit length s. The bit strings in the sequence are called data segments, and the plaintext is denoted P^#₁ , P^#₂ ,…, P^#_n.

For the OFB and CTR modes, the plaintext need not be a multiple of the block size. Let n and u denote the unique pair of positive integers such that the total number of bits in the message is (n-1)b+u, where 1 < u < b. The plaintext consists of a sequence of n bit strings, in which the bit length of the last bit string is u, and the bit length of the other bit strings is b. The sequence is denoted P₁, P₂,…, P_n-1, P^*_n, and the bit strings are called data blocks, although the last bit string, P^*_n, n may not be a complete block.

For each mode, the encryption process transforms every plaintext data block or segment into a corresponding ciphertext data block or segment with the same bit length, so that the ciphertext is a sequence of data blocks or segments. The ciphertext is denoted as follows: for the ECB and CBC modes, C₁ , C₂ ,…, C_n; for the CFB mode, C^#₁, C^#₂,…, C^#_n ; and, for the OFB and CTR modes, C₁, C₂,…, C_n-1, C^*_n may be a partial block.

The formatting of the plaintext, including in some cases the appending of padding bits to form complete data blocks or data segments, is outside the scope of this recommendation. Padding is discussed in Appendix A.

5.3 Initialization Vectors

The input to the encryption processes of the CBC, CFB, and OFB modes includes, in addition to the plaintext, a data block called the initialization vector (IV), denoted IV. The IV is used in an initial step in the encryption of a message and in the corresponding decryption of the message.

The IV need not be secret; however, for the CBC and CFB modes, the IV for any particular execution of the encryption process must be unpredictable, and, for the OFB mode, unique IVs must be used for each execution of the encryption process. The generation of IVs is discussed in Appendix C.

5.4 Examples of Operations and Functions

The concatenation operation on bit strings is denoted | ; for example, 001 | 10111 = 00110111.

Given bit strings of equal length, the exclusive-OR operation, denoted , specifies the addition, modulo 2, of the bits in each bit position, i.e., without carries. Thus, 10011 10101= 00110, for example.

The functions LSB_s and MSB_s return the s least significant bits and the s most significant bits of their arguments. For example, LSB₃ (111011010) = 010, and MSB₄ (111011010) = 1110.

Given a positive integer m and a non-negative (decimal) integer x that is less than 2^m, the binary representation of x in m bits is denoted [x]_m. For example, [45]₈ = 00101101.

6 Block Cipher Modes of Operation

The mathematical specifications of the five modes are given in Sections 6.1-6.5, along with descriptions, illustrations, and comments on the potential for parallel processing.

6.1 The Electronic Codebook Mode

The Electronic Codebook (ECB) mode is a confidentiality mode that features, for a given key, the assignment of a fixed ciphertext block to each plaintext block, analogous to the assignment of code words in a codebook. The Electronic Codebook (ECB) mode is defined as follows:

ECB Encryption: C_j = CIPH^K(P^j) for j = 1 … n.

ECB Decryption: P_j = CIPH^-1_K(C_j) for j = 1 … n.

In ECB encryption, the forward cipher function is applied directly and independently to each block of the plaintext. The resulting sequence of output blocks is the ciphertext.

In ECB decryption, the inverse cipher function is applied directly and independently to each block of the ciphertext. The resulting sequence of output blocks is the plaintext.

Figure 1: The ECB Mode

In ECB encryption and ECB decryption, multiple forward cipher functions and inverse cipher functions can be computed in parallel.

In the ECB mode, under a given key, any given plaintext block always gets encrypted to the same ciphertext block. If this property is undesirable in a particular application, the ECB mode should not be used.

The ECB mode is illustrated in Figure 1.

6.2 The Cipher Block Chaining Mode

The Cipher Block Chaining (CBC) mode is a confidentiality mode whose encryption process features the combining (“chaining”) of the plaintext blocks with the previous ciphertext blocks. The CBC mode requires an IV to combine with the first plaintext block. The IV need not be secret, but it must be unpredictable; the generation of such IVs is discussed in Appendix C. Also, the integrity of the IV should be protected, as discussed in Appendix D. The CBC mode is defined as follows:

CBC Encryption: C₁ = CIPH_K(P₁IV);
C_j = CIPH_K(P_jC_j_-1) for j = 2 … n.
CBC Decryption: P₁ = CIPH^-1_K(C₁)IV;
P_j = CIPH^-1_K(C_j)C_j_-1 for j = 2 … n.

Figure 2: The CBC Mode

In CBC encryption, the first input block is formed by exclusive-ORing the first block of the plaintext with the IV. The forward cipher function is applied to the first input block, and the resulting output block is the first block of the ciphertext. This output block is also exclusive-ORed with the second plaintext data block to produce the second input block, and the forward cipher function is applied to produce the second output block. This output block, which is the second ciphertext block, is exclusive-ORed with the next plaintext block to form the next input block. Each successive plaintext block is exclusive-ORed with the previous output/ciphertext block to produce the new input block. The forward cipher function is applied to each input block to produce the ciphertext block.

In CBC decryption, the inverse cipher function is applied to the first ciphertext block, and the resulting output block is exclusive-ORed with the initialization vector to recover the first plaintext block. The inverse cipher function is also applied to the second ciphertext block, and the resulting output block is exclusive-ORed with the first ciphertext block to recover the second plaintext block. In general, to recover any plaintext block (except the first), the inverse cipher function is applied to the corresponding ciphertext block, and the resulting block is exclusive-ORed with the previous ciphertext block.

In CBC encryption, the input block to each forward cipher operation (except the first) depends on the result of the previous forward cipher operation, so the forward cipher operations cannot be performed in parallel. In CBC decryption, however, the input blocks for the inverse cipher function, i.e., the ciphertext blocks, are immediately available, so that multiple inverse cipher operations can be performed in parallel.

The CBC mode is illustrated in Figure 2.

6.3 The Cipher Feedback Mode

The Cipher Feedback (CFB) mode is a confidentiality mode that features the feedback of successive ciphertext segments into the input blocks of the forward cipher to generate output blocks that are exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The CFB mode requires an IV as the initial input block. The IV need not be secret, but it must be unpredictable; the generation of such IVs is discussed in Appendix C.

The CFB mode also requires an integer parameter, denoted s, such that 1 < s < b. In the specification of the CFB mode below, each plaintext segment (P^#_j) and ciphertext segment (C^#_j) consists of s bits. The value of s is sometimes incorporated into the name of the mode, e.g., the 1-bit CFB mode, the 8-bit CFB mode, the 64-bit CFB mode, or the 128-bit CFB mode.

The CFB mode is defined as follows:

CFB Encryption: I₁ = IV;
I_j = LSB_b-s (I_j_-1 ) | C^#_j_-1 for j = 2 … n;
O_j = CIPH_K(I_j) for j = 1, 2 … n;
C^#_j = P^#_jMSB_s(O_j) for j = 1, 2 … n.
CFB Decryption: I₁ = IV;
I_j = LSB_b-s (I_j_-1 ) | C^#_j_-1 for j = 2 … n;
O_j = CIPH_K(I_j) for j = 1, 2 … n;
P^#_j = C^#_jMSB_s(O_j) for j = 1, 2 … n.

In CFB encryption, the first input block is the IV, and the forward cipher operation is applied to the IV to produce the first output block. The first ciphertext segment is produced by exclusive-ORing the first plaintext segment with the s most significant bits of the first output block. (The remaining b-s bits of the first output block are discarded.) The b-s least significant bits of the IV are then concatenated with the s bits of the first ciphertext segment to form the second input block. An alternative description of the formation of the second input block is that the bits of the first input block circularly shift s positions to the left, and then the ciphertext segment replaces the s least significant bits of the result.

The process is repeated with the successive input blocks until a ciphertext segment is produced from every plaintext segment. In general, each successive input block is enciphered to produce an output block. The s most significant bits of each output block are exclusive-ORed with the corresponding plaintext segment to form a ciphertext segment. Each ciphertext segment (except the last one) is “fed back” into the previous input block, as described above, to form a new input block. The feedback can be described in terms of the individual bits in the strings as follows: if i₁i2 …i_b is the j^th input block, and c₁c₂ …c_s is the jth ciphertext segment, then the (j+1)^th input block is i_s₊₁i_s₊₂ …i_bc₁c₂ …c_s.

Figure 3: The CFB Mode

In CFB decryption, the IV is the first input block, and each successive input block is formed as in CFB encryption, by concatenating the b-s least significant bits of the previous input block with the s most significant bits of the previous ciphertext. The forward cipher function is applied to each input block to produce the output blocks. The s most significant bits of the output blocks are exclusive-ORed with the corresponding ciphertext segments to recover the plaintext segments.

In CFB encryption, like CBC encryption, the input block to each forward cipher function (except the first) depends on the result of the previous forward cipher function; therefore, multiple forward cipher operations cannot be performed in parallel. In CFB decryption, the required forward cipher operations can be performed in parallel if the input blocks are first constructed (in series) from the IV and the ciphertext.

The CFB mode is illustrated in Figure 3.

6.4 The Output Feedback Mode

The Output Feedback (OFB) mode is a confidentiality mode that features the iteration of the forward cipher on an IV to generate a sequence of output blocks that are exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The OFB mode requires that the IV is a nonce, i.e., the IV must be unique for each execution of the mode under the given key; the generation of such IVs is discussed in Appendix C. The OFB mode is defined as follows:

OFB Encryption: I₁ = IV;
I_j = O_j_-1 for j = 2 … n;
O_j = CIPH_K(I_j) for j = 1, 2 … n;
C_j = P_jO_j for j = 1, 2 … n-1;
C^*_n = P^*_nMSB_u(O_n).
OFB Decryption: I₁ = IV;
I_j = O_j_-1 for j = 2 … n;
O_j = CIPH_K(I_j) for j = 1, 2 … n;
P_j = C_jO_j for j = 1, 2 … n-1;
P^*_n = C^*_nMSB_u(O_n).

In OFB encryption, the IV is transformed by the forward cipher function to produce the first output block. The first output block is exclusive-ORed with the first plaintext block to produce the first ciphertext block. The forward cipher function is then invoked on the first output block to produce the second output block. The second output block is exclusive-ORed with the second plaintext block to produce the second ciphertext block, and the forward cipher function is invoked on the second output block to produce the third output block. Thus, the successive output blocks are produced from applying the forward cipher function to the previous output blocks, and the output blocks are exclusive-ORed with the corresponding plaintext blocks to produce the ciphertext blocks. For the last block, which may be a partial block of u bits, the most significant u bits of the last output block are used for the exclusive-OR operation; the remaining b-u bits of the last output block are discarded.

In OFB decryption, the IV is transformed by the forward cipher function to produce the first output block. The first output block is exclusive-ORed with the first ciphertext block to recover the first plaintext block. The first output block is then transformed by the forward cipher function to produce the second output block. The second output block is exclusive-ORed with the second ciphertext block to produce the second plaintext block, and the second output block is also transformed by the forward cipher function to produce the third output block. Thus, the successive output blocks are produced from applying the forward cipher function to the previous output blocks, and the output blocks are exclusive-ORed with the corresponding ciphertext blocks to recover the plaintext blocks. For the last block, which may be a partial block of u bits, the most significant u bits of the last output block are used for the exclusive-OR operation; the remaining b-u bits of the last output block are discarded.

Figure 4: The OFB Mode

In both OFB encryption and OFB decryption, each forward cipher function (except the first) depends on the results of the previous forward cipher function; therefore, multiple forward cipher functions cannot be performed in parallel. However, if the IV is known, the output blocks can be generated prior to the availability of the plaintext or ciphertext data.

The OFB mode requires a unique IV for every message that is ever encrypted under the given key. If, contrary to this requirement, the same IV is used for the encryption of more than one message, then the confidentiality of those messages may be compromised. In particular, if a plaintext block of any of these messages is known, say, the jth plaintext block, then the jth output of the forward cipher function can be determined easily from the jth ciphertext block of the message. This information allows the jth plaintext block of any other message that is encrypted using the same IV to be easily recovered from the jth ciphertext block of that message.

Confidentiality may similarly be compromised if any of the input blocks to the forward cipher function for the encryption of a message is designated as the IV for the encryption of another message under the given key.

The OFB mode is illustrated in Figure 4.

6.5 The Counter Mode

The Counter (CTR) mode is a confidentiality mode that features the application of the forward cipher to a set of input blocks, called counters, to produce a sequence of output blocks that are exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The sequence of counters must have the property that each block in the sequence is different from every other block. This condition is not restricted to a single message: across all of the messages that are encrypted under the given key, all of the counters must be distinct. In this recommendation, the counters for a given message are denoted T₁, T₂, … , T_n. Methods for generating counters are discussed in Appendix B. Given a sequence of counters, T₁, T₂, … , T_n, the CTR mode is defined as follows:

CTR Encryption: O_j = CIPH_K(T_j) for j = 1, 2 … n;
C_j = P_jO_j for j = 1, 2 … n-1;
C^*_n = P^*_nMSB_u(O_n).
CTR Decryption: O_j = CIPH_K(T_j) for j = 1, 2 … n;
P_j = C_jO_j for j = 1, 2 … n-1;
P^*_n = C^*_nMSB_u(O_n).

In CTR encryption, the forward cipher function is invoked on each counter block, and the resulting output blocks are exclusive-ORed with the corresponding plaintext blocks to produce the ciphertext blocks. For the last block, which may be a partial block of u bits, the most significant u bits of the last output block are used for the exclusive-OR operation; the remaining b-u bits of the last output block are discarded.

In CTR decryption, the forward cipher function is invoked on each counter block, and the resulting output blocks are exclusive-ORed with the corresponding ciphertext blocks to recover the plaintext blocks. For the last block, which may be a partial block of u bits, the most significant u bits of the last output block are used for the exclusive-OR operation; the remaining b-u bits of the last output block are discarded.

In both CTR encryption and CTR decryption, the forward cipher functions can be performed in parallel; similarly, the plaintext block that corresponds to any particular ciphertext block can be recovered independently from the other plaintext blocks if the corresponding counter block can be determined. Moreover, the forward cipher functions can be applied to the counters prior to the availability of the plaintext or ciphertext data.

Figure 5: The CTR Mode

The CTR mode is illustrated in Figure 5.

Appendix A: Padding

For the ECB, CBC, and CFB modes, the plaintext must be a sequence of one or more complete data blocks (or, for CFB mode, data segments). In other words, for these three modes, the total number of bits in the plaintext must be a positive multiple of the block (or segment) size.

If the data string to be encrypted does not initially satisfy this property, then the formatting of the plaintext must entail an increase in the number of bits. A common way to achieve the necessary increase is to append some extra bits, called padding, to the trailing end of the data string as the last step in the formatting of the plaintext. An example of a padding method is to append a single ‘1’ bit to the data string and then to pad the resulting string by as few ‘0’ bits, possibly none, as are necessary to complete the final block (segment). Other methods may be used; in general, the formatting of the plaintext is outside the scope of this recommendation.

For the above padding method, the padding bits can be removed unambiguously, provided the receiver can determine that the message is indeed padded. One way to ensure that the receiver does not mistakenly remove bits from an unpadded message is to require the sender to pad every message, including messages in which the final block (segment) is already complete. For such messages, an entire block (segment) of padding is appended. Alternatively, such messages can be sent without padding if, for every message, the existence of padding can be reliably inferred, e.g., from a message length indicator.

Appendix B: Generation of Counter Blocks

The specification of the CTR mode requires a unique counter block for each plaintext block that is ever encrypted under a given key, across all messages. If, contrary to this requirement, a counter block is used repeatedly, then the confidentiality of all of the plaintext blocks corresponding to that counter block may be compromised. In particular, if any plaintext block that is encrypted using a given counter block is known, then the output of the forward cipher function can be determined easily from the associated ciphertext block. This output allows any other plaintext blocks that are encrypted using the same counter block to be easily recovered from their associated ciphertext blocks.

There are two aspects to satisfying the uniqueness requirement. First, an incrementing function for generating the counter blocks from any initial counter block can ensure that counter blocks do not repeat within a given message. Second, the initial counter blocks, T1 , must be chosen to ensure that counters are unique across all messages that are encrypted under the given key.

B.1 The Standard Incrementing Function

In general, given the initial counter block for a message, the successive counter blocks are derived by applying an incrementing function. As in the above specifications of the modes, n is the number of blocks in the given plaintext message, and b is the number of bits in the block.

The standard incrementing function can apply either to an entire block or to a part of a block. Let m be the number of bits in the specific part of the block to be incremented; thus, m is a positive integer such that m < b. Any string of m bits can be regarded as the binary representation of a non-negative integer x that is strictly less than 2^m. The standard incrementing function takes [x]_m and returns [x+1 mod 2^m]_m.

For example, let the standard incrementing function apply to the five least significant bits of eight bit blocks, so that b=8 and m=5 (unrealistically small values); let * represent each unknown bit in this example, and let ***11110 represent a block to be incremented. The following sequence of blocks results from four applications of the standard incrementing function:

* * * 1 1 1 1 0
* * * 1 1 1 1 1
* * * 0 0 0 0 0
* * * 0 0 0 0 1
* * * 0 0 0 1 0.

Counter blocks in which a given set of m bits are incremented by the standard incrementing function satisfy the uniqueness requirement within the given message provided that n < 2^m. Whether the uniqueness requirement for counter blocks is satisfied across all messages that are encrypted under a given key then depends on the choices of the initial counter blocks for the messages, as discussed in the next section.

This recommendation permits the use of any other incrementing function that generates n unique strings of m bits in succession from the allowable initial strings. For example, if the initial string of m bits is not the “zero” string, i.e., if it contains at least one ‘1’ bit, then an incrementing function can be constructed from a linear feedback shift register that is specialized to ensure a sufficiently large period; see Ref. [5] for information about linear feedback shift registers.

B.2 Choosing Initial Counter Blocks

The initial counter blocks, T₁, for each message that is encrypted under the given key must be chosen in a manner than ensures the uniqueness of all the counter blocks across all the messages. Two examples of approaches to choosing the initial counter blocks are given in this section.

In the first approach, for a given key, all plaintext messages are encrypted sequentially. Within the messages, the same fixed set of m bits of the counter block is incremented by the standard incrementing function. The initial counter block for the initial plaintext message may be any string of b bits. The initial counter block for any subsequent message can be obtained by applying the standard incrementing function to the fixed set of m bits of the final counter block of the previous message. In effect, all of the plaintext messages that are ever encrypted under the given key are concatenated into a single message; consequently, the total number of plaintext blocks must not exceed 2^m. Procedures should be established to ensure the maintenance of the state of the final counter block of the latest encrypted message, and to ensure the proper sequencing of the messages.

A second approach to satisfying the uniqueness property across messages is to assign to each message a unique string of b/2 bits (rounding up, if b is odd), in other words, a message nonce, and to incorporate the message nonce into every counter block for the message. The leading b/2 bits (rounding up, if b is odd) of each counter block would be the message nonce, and the standard incrementing function would be applied to the remaining m bits to provide an index to the counter blocks for the message. Thus, if N is the message nonce for a given message, then the jth counter block is given by T_j = N | [j]_m, for j = 1…n. The number of blocks, n, in any message must satisfy n < 2^m. A procedure should be established to ensure the uniqueness of the message nonces.

This recommendation allows other methods and approaches for achieving the uniqueness property. Validation that an implementation of the CTR mode conforms to this recommendation will typically include an examination of the procedures for assuring the uniqueness of counter blocks within messages and across all messages that are encrypted under a given key.

Appendix C: Generation of Initialization Vectors

The CBC, CFB, and OFB modes require an initialization vector as input, in addition to the plaintext. An IV must be generated for each execution of the encryption operation, and the same IV is necessary for the corresponding execution of the decryption operation. Therefore, the IV, or information that is sufficient to calculate the IV, must be available to each party to the communication.

The IV need not be secret, so the IV, or information sufficient to determine the IV, may be transmitted with the ciphertext.

For the CBC and CFB modes, the IVs must be unpredictable. In particular, for any given plaintext, it must not be possible to predict the IV that will be associated to the plaintext in advance of the generation of the IV.

There are two recommended methods for generating unpredictable IVs. The first method is to apply the forward cipher function, under the same key that is used for the encryption of the plaintext, to a nonce. The nonce must be a data block that is unique to each execution of the encryption operation. For example, the nonce may be a counter, as described in Appendix B, or a message number. The second method is to generate a random data block using a FIPS-approved random number generator.

For the OFB mode, the IV need not be unpredictable, but it must be a nonce that is unique to each execution of the encryption operation. For example, the nonce may be a counter, as described in Appendix B, or a message number.

If, contrary to this requirement, the same IV is used for the OFB encryption of more than one message, then the confidentiality of those messages may be compromised. In particular, if a plaintext block of any of these messages is known, say, the jth plaintext block, then the jth output of the forward cipher function can be determined easily from the jth ciphertext block of the message. This information allows the jth plaintext block of any other message that is encrypted using the same IV to be easily recovered from the jth ciphertext block of that message.

Confidentiality may similarly be compromised if any of the input blocks to the forward cipher function for the OFB encryption of a message is designated as the IV for the encryption of another message under the given key. One consequence of this observation is that IVs for the OFB mode should not be generated by invoking the block cipher on another IV.

Validation that an implementation of the CBC, CFB, or OFB mode conforms to this recommendation will typically include an examination of the procedures for assuring the unpredictability or uniqueness of the IV.

Appendix D: Error Properties

A bit error is the substitution of a ‘0’ bit for a ‘1’ bit, or vice versa. This appendix contains a discussion of the effects of bit errors in ciphertext blocks (or segments), counter blocks, and IVs on the modes in this recommendation. Insertion or deletion of bits into ciphertext blocks (or segments) is also discussed.

For any confidentiality mode, if there are any bit errors in a single ciphertext block (or segment), then the decryption of that ciphertext block (or segment) will be incorrect, i.e., it will differ from the original plaintext block (or segment). In the CFB, OFB, and CTR modes, the bit error(s) in the decrypted ciphertext block (or segment) occur in the same bit position(s) as in the ciphertext block (or segment); the other bit positions are not affected. In the ECB and CBC modes, a bit error may occur, independently, in any bit position of the decrypted ciphertext block, with an expected error rate of fifty percent, depending on the strength of the underlying block cipher.

For the ECB, OFB, and CTR modes, bit errors within a ciphertext block do not affect the decryption of any other blocks. In the CBC mode, any bit positions that contain bit errors in a ciphertext block will also contain bit errors in the decryption of the succeeding ciphertext block; the other bit positions are not affected. In the CFB mode, bit errors in a ciphertext segment affect the decryption of the next b/s (rounded up to the nearest integer) ciphertext segments. A bit error may occur, independently, in any bit position in these decrypted segments, with an expected error rate of fifty percent.

Similarly, for the CTR mode, if there is a bit error in a counter block, then a bit error may occur, independently, in any bit position of the decryption of the corresponding ciphertext, with an expected error rate of fifty percent.

Bit errors in IVs also affect the decryption process. In the OFB mode, bit errors in the IV affect the decryption of every ciphertext block. In the CFB mode, bit errors in the IV affect, at a minimum, the decryption of the first ciphertext segment, and possibly successive ciphertext segments, depending on the bit position of the rightmost bit error in the IV. (In general, a bit error in the ith most significant bit position affects the decryptions of the first i/s (rounding up) ciphertext segments.) For both the OFB and CFB modes, a bit error may occur, independently, in any bit position of the affected ciphertext blocks (or segments), with an expected error rate of fifty percent. In the CBC mode, if bit errors occur in the IV, then the first ciphertext block will be decrypted incorrectly, and bit errors will occur in exactly the same bit positions as in the IV; the decryptions of the other ciphertext blocks are not affected.

Consequently, for the CBC mode, the decryption of the first ciphertext block is vulnerable to the (deliberate) introduction of bit errors in specific bit positions of the IV if the integrity of the IV is not protected. Similarly, for the OFB and CTR modes, the decryption of any ciphertext block is vulnerable to the introduction of specific bit errors into that ciphertext block if its integrity is not protected. The same property also holds for the ciphertext segments in the CFB mode; however, for every ciphertext segment except the last one, the existence of such bit errors may be detected by their randomizing effect on the decryption of the succeeding ciphertext segment.

Table D.1 summarizes the effects of bit errors in a ciphertext block or IV on the decryption of the ciphertext for each of the five confidentiality modes.

Table D.1e five confidentiality modes.

Table D.2: Summary of Effect of Bit Errors on Decryption

Mode

Effect of Bit Errors in C_j

Effect of Bit Errors in the IV

ECB RBE in the decryption of C_j Not applicable

CBC RBE in the decryption of C_j
SBE in the decryption of C_j₊₁ SBE in the decryption of C₁

CFB SBE in the decryption of C_j
RBE in the decryption of C_j₊₁ ,…,C_j_+b/s RBE in the decryption of C₁, C₂, …, C_j
for some j between 1 and b/s

OFB SBE in the decryption of C_j RBE in the decryption of C₁, C₂, …, C_n

CTR SBE in the decryption of C_j Not applicable *

RBE: random bit errors, i.e., bit errors occur independently in any bit position with an expected probability of ½.
SBE: specific bit errors, i.e., bit errors occur in the same bit position(s) as the original bit error(s).
* Bit errors in the jth counter block, T_j , result in RBE in the decryption of C_j.

The deletion or insertion of bits into a ciphertext block (or segment) spoils the synchronization of the block (or segment) boundaries; in effect, bit errors may occur in the bit position of the inserted or deleted bit, and in every subsequent bit position. Therefore, the decryptions of the subsequent ciphertext blocks (or segments) will almost certainly be incorrect until the synchronization is restored. When the 1-bit CFB mode is used, then the synchronization is automatically restored b+1 positions after the inserted or deleted bit. For other values of s in the CFB mode, and for the other confidentiality modes in this recommendation, the synchronization must be restored externally.

Appendix E: Modes of Triple DES

FIPS Pub 46-3 [FIPS 46-3] specifies the Data Encryption Standard (DES) algorithm and approves its three-fold, compound operation that is specified in ANSI X9.52 [1]: the Triple Data Encryption Algorithm (TDEA). Essentially, the TDEA consists of the application of the forward DES algorithm, i.e, DES encryption, under one key, followed by the application of the inverse DES algorithm, i.e., DES decryption, under a second key, followed by the application of the forward DES algorithm under a third key. The TDEA is often called Triple DES.

FIPS Pub 46-3 also approves the seven modes of operation of Triple DES that are specified in ANSI X9.52. Four of those modes are equivalent to modes in this recommendation with the TDEA as the underlying block cipher. In particular, the TECB, TCBC, and TOFB modes in ANSI X9.52 are equivalent to the ECB, CBC, and OFB modes in this recommendation, with the TDEA as the underlying block cipher; the TCFB mode in ANSI X9.52 is equivalent to the CFB mode in this recommendation, with the TDEA as the underlying block cipher, provided that the possible choices of the parameter s (the segment size) are restricted to three values: 1, 8, and 64. The remaining three modes in ANSI X9.52 are TCBC-I, TCFB-P, and TOFB-I; they are mode variants that allow for interleaving or pipelining; this recommendation does not provide analogues of these three modes.

The Triple DES modes in ANSI X9.52 should not be used as the underlying block cipher algorithm for the modes in this recommendation. However, the Triple DES algorithm, i.e., TDEA, as described above, may be used as the underlying block cipher algorithm for the six modes in this recommendation. One of the resulting modes of Triple DES is new, i.e., not specified in ANSI X9.52: the CTR mode of the TDEA.

Appendix F: Example Vectors for Modes of Operation of the AES

In this appendix, three examples are provided for each of the modes in this recommendation with the AES algorithm [2] as the underlying block cipher: one example is given for each of the allowed key sizes (128, 192, and 256 bits). Some intermediate results are presented. For the five confidentiality modes, examples are provided for both encryption and decryption. Examples are provided for 1-bit, 8-bit, and 128 bit CFB. The plaintext for all but two of these examples is equivalent to the following string of hexadecimal characters, formatted into four 128 bit blocks:

               6bc1bee22e409f96e93d7e117393172a
               ae2d8a571e03ac9c9eb76fac45af8e51
               30c81c46a35ce411e5fbc1191a0a52ef
               f69f2445df4f9b17ad2b417be66c3710.

For the example of 1-bit CFB, the plaintext is the first 16 bits in the above string; for the example of 8-bit CFB, the plaintext is the first 18 octets in the above string. All strings are presented in hexadecimal notation, except in the example of 1-bit CFB, where the plaintext and ciphertext segments are single bits.

F.1 ECB Example Vectors

F.1.1 ECB-AES128.Encrypt

               
Key            2b7e151628aed2a6abf7158809cf4f3c
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc1bee22e409f96e93d7e117393172a
Output Block   3ad77bb40d7a3660a89ecaf32466ef97
Ciphertext     3ad77bb40d7a3660a89ecaf32466ef97
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    ae2d8a571e03ac9c9eb76fac45af8e51
Output Block   f5d3d58503b9699de785895a96fdbaaf
Ciphertext     f5d3d58503b9699de785895a96fdbaaf
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    30c81c46a35ce411e5fbc1191a0a52ef
Output Block   43b1cd7f598ece23881b00e3ed030688
Ciphertext     43b1cd7f598ece23881b00e3ed030688
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    f69f2445df4f9b17ad2b417be66c3710
Output Block   7b0c785e27e8ad3f8223207104725dd4
Ciphertext     7b0c785e27e8ad3f8223207104725dd4

F.1.2 ECB-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
Block #1
Ciphertext     3ad77bb40d7a3660a89ecaf32466ef97
Input Block    3ad77bb40d7a3660a89ecaf32466ef97
Output Block   6bc1bee22e409f96e93d7e117393172a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     f5d3d58503b9699de785895a96fdbaaf
Input Block    f5d3d58503b9699de785895a96fdbaaf
Output Block   ae2d8a571e03ac9c9eb76fac45af8e51
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     43b1cd7f598ece23881b00e3ed030688
Input Block    43b1cd7f598ece23881b00e3ed030688
Output Block   30c81c46a35ce411e5fbc1191a0a52ef
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     7b0c785e27e8ad3f8223207104725dd4
Input Block    7b0c785e27e8ad3f8223207104725dd4
Output Block   f69f2445df4f9b17ad2b417be66c3710
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.1.3 ECB-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc1bee22e409f96e93d7e117393172a
Output Block   bd334f1d6e45f25ff712a214571fa5cc
Ciphertext     bd334f1d6e45f25ff712a214571fa5cc
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    ae2d8a571e03ac9c9eb76fac45af8e51
Output Block   974104846d0ad3ad7734ecb3ecee4eef
Ciphertext     974104846d0ad3ad7734ecb3ecee4eef
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    30c81c46a35ce411e5fbc1191a0a52ef
Output Block   ef7afd2270e2e60adce0ba2face6444e
Ciphertext     ef7afd2270e2e60adce0ba2face6444e
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    f69f2445df4f9b17ad2b417be66c3710
Output Block   9a4b41ba738d6c72fb16691603c18e0e
Ciphertext     9a4b41ba738d6c72fb16691603c18e0e

F.1.4 ECB-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
Block #1
Ciphertext     bd334f1d6e45f25ff712a214571fa5cc
Input Block    bd334f1d6e45f25ff712a214571fa5cc
Output Block   6bc1bee22e409f96e93d7e117393172a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     974104846d0ad3ad7734ecb3ecee4eef
Input Block    974104846d0ad3ad7734ecb3ecee4eef
Output Block   ae2d8a571e03ac9c9eb76fac45af8e51
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     ef7afd2270e2e60adce0ba2face6444e
Input Block    ef7afd2270e2e60adce0ba2face6444e
Output Block   30c81c46a35ce411e5fbc1191a0a52ef
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     9a4b41ba738d6c72fb16691603c18e0e
Input Block    9a4b41ba738d6c72fb16691603c18e0e
Output Block   f69f2445df4f9b17ad2b417be66c3710
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.1.5 ECB-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc1bee22e409f96e93d7e117393172a
Output Block   f3eed1bdb5d2a03c064b5a7e3db181f8
Ciphertext     f3eed1bdb5d2a03c064b5a7e3db181f8
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    ae2d8a571e03ac9c9eb76fac45af8e51
Output Block   591ccb10d410ed26dc5ba74a31362870
Ciphertext     591ccb10d410ed26dc5ba74a31362870
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    30c81c46a35ce411e5fbc1191a0a52ef
Output Block   b6ed21b99ca6f4f9f153e7b1beafed1d
Ciphertext     b6ed21b99ca6f4f9f153e7b1beafed1d
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    f69f2445df4f9b17ad2b417be66c3710
Output Block   23304b7a39f9f3ff067d8d8f9e24ecc7
Ciphertext     23304b7a39f9f3ff067d8d8f9e24ecc7

F.1.6 ECB-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
Block #1
Ciphertext     f3eed1bdb5d2a03c064b5a7e3db181f8
Input Block    f3eed1bdb5d2a03c064b5a7e3db181f8
Output Block   6bc1bee22e409f96e93d7e117393172a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     591ccb10d410ed26dc5ba74a31362870
Input Block    591ccb10d410ed26dc5ba74a31362870
Output Block   ae2d8a571e03ac9c9eb76fac45af8e51
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     b6ed21b99ca6f4f9f153e7b1beafed1d
Input Block    b6ed21b99ca6f4f9f153e7b1beafed1d
Output Block   30c81c46a35ce411e5fbc1191a0a52ef
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     23304b7a39f9f3ff067d8d8f9e24ecc7
Input Block    23304b7a39f9f3ff067d8d8f9e24ecc7
Output Block   f69f2445df4f9b17ad2b417be66c3710
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.2 CBC Example Vectors

F.2.1 CBC-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc0bce12a459991e134741a7f9e1925
Output Block   7649abac8119b246cee98e9b12e9197d
Ciphertext     7649abac8119b246cee98e9b12e9197d
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    d86421fb9f1a1eda505ee1375746972c
Output Block   5086cb9b507219ee95db113a917678b2
Ciphertext     5086cb9b507219ee95db113a917678b2
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    604ed7ddf32efdff7020d0238b7c2a5d
Output Block   73bed6b8e3c1743b7116e69e22229516
Ciphertext     73bed6b8e3c1743b7116e69e22229516
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    8521f2fd3c8eef2cdc3da7e5c44ea206
Output Block   3ff1caa1681fac09120eca307586e1a7
Ciphertext     3ff1caa1681fac09120eca307586e1a7

F.2.2 CBC-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Block #1
Ciphertext     7649abac8119b246cee98e9b12e9197d
Input Block    7649abac8119b246cee98e9b12e9197d
Output Block   6bc0bce12a459991e134741a7f9e1925
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     5086cb9b507219ee95db113a917678b2
Input Block    5086cb9b507219ee95db113a917678b2
Output Block   d86421fb9f1a1eda505ee1375746972c
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     73bed6b8e3c1743b7116e69e22229516
Input Block    73bed6b8e3c1743b7116e69e22229516
Output Block   604ed7ddf32efdff7020d0238b7c2a5d
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     3ff1caa1681fac09120eca307586e1a7
Input Block    3ff1caa1681fac09120eca307586e1a7
Output Block   8521f2fd3c8eef2cdc3da7e5c44ea206
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.2.3 CBC-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc0bce12a459991e134741a7f9e1925
Output Block   4f021db243bc633d7178183a9fa071e8
Ciphertext     4f021db243bc633d7178183a9fa071e8
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    e12f97e55dbfcfa1efcf7796da0fffb9
Output Block   b4d9ada9ad7dedf4e5e738763f69145a
Ciphertext     b4d9ada9ad7dedf4e5e738763f69145a
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    8411b1ef0e2109e5001cf96f256346b5
Output Block   571b242012fb7ae07fa9baac3df102e0
Ciphertext     571b242012fb7ae07fa9baac3df102e0
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    a1840065cdb4e1f7d282fbd7db9d35f0
Output Block   08b0e27988598881d920a9e64f5615cd
Ciphertext     08b0e27988598881d920a9e64f5615cd

F.2.4 CBC-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Block #1
Ciphertext     4f021db243bc633d7178183a9fa071e8
Input Block    4f021db243bc633d7178183a9fa071e8
Output Block   6bc0bce12a459991e134741a7f9e1925
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     b4d9ada9ad7dedf4e5e738763f69145a
Input Block    b4d9ada9ad7dedf4e5e738763f69145a
Output Block   e12f97e55dbfcfa1efcf7796da0fffb9
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     571b242012fb7ae07fa9baac3df102e0
Input Block    571b242012fb7ae07fa9baac3df102e0
Output Block   8411b1ef0e2109e5001cf96f256346b5
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     08b0e27988598881d920a9e64f5615cd
Input Block    08b0e27988598881d920a9e64f5615cd
Output Block   a1840065cdb4e1f7d282fbd7db9d35f0
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.2.5 CBC-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Block #1
Plaintext      6bc1bee22e409f96e93d7e117393172a
Input Block    6bc0bce12a459991e134741a7f9e1925
Output Block   f58c4c04d6e5f1ba779eabfb5f7bfbd6
Ciphertext     f58c4c04d6e5f1ba779eabfb5f7bfbd6
Block #2
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Input Block    5ba1c653c8e65d26e929c4571ad47587
Output Block   9cfc4e967edb808d679f777bc6702c7d
Ciphertext     9cfc4e967edb808d679f777bc6702c7d
Block #3
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Input Block    ac3452d0dd87649c8264b662dc7a7e92
Output Block   39f23369a9d9bacfa530e26304231461
Ciphertext     39f23369a9d9bacfa530e26304231461
Block #4
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Input Block    cf6d172c769621d8081ba318e24f2371
Output Block   b2eb05e2c39be9fcda6c19078c6a9d1b
Ciphertext     b2eb05e2c39be9fcda6c19078c6a9d1b

F.2.6 CBC-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Block #1
Ciphertext     f58c4c04d6e5f1ba779eabfb5f7bfbd6
Input Block    f58c4c04d6e5f1ba779eabfb5f7bfbd6
Output Block   6bc0bce12a459991e134741a7f9e1925
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Ciphertext     9cfc4e967edb808d679f777bc6702c7d
Input Block    9cfc4e967edb808d679f777bc6702c7d
Output Block   5ba1c653c8e65d26e929c4571ad47587
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Ciphertext     39f23369a9d9bacfa530e26304231461
Input Block    39f23369a9d9bacfa530e26304231461
Output Block   ac3452d0dd87649c8264b662dc7a7e92
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Ciphertext     b2eb05e2c39be9fcda6c19078c6a9d1b
Input Block    b2eb05e2c39be9fcda6c19078c6a9d1b
Output Block   cf6d172c769621d8081ba318e24f2371
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.3 CFB Example Vectors

F.3.1 CFB1-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Plaintext      0
Ciphertext     0
Segment #2
Input Block    00020406080a0c0e10121416181a1c1e
Output Block   19cf576c7596e702f298b35666955c79
Plaintext      1
Ciphertext     1
Segment #3
Input Block    0004080c1014181c2024282c3034383d
Output Block   59e17759acd02b801fa321ea059e331f
Plaintext      1
Ciphertext     1
Segment #4
Input Block    0008101820283038404850586068707b
Output Block   71f415b0cc109e8b0faa14ab740c22f4
Plaintext      0
Ciphertext     0
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f6
Output Block   3fb76d3d1048179964597a0f64d5adad
Plaintext      1
Ciphertext     1
Segment #6
Input Block    0020406080a0c0e10121416181a1c1ed
Output Block   4c943b4bac54ab974e3e52326d29aaa1
Plaintext      0
Ciphertext     0
Segment #7
Input Block    004080c1014181c2024282c3034383da
Output Block   c94da41eb3d3acf1993a512ab1e8203f
Plaintext      1
Ciphertext     0
Segment #8
Input Block    008101820283038404850586068707b4
Output Block   e07f5e98778f75dbb2691c3f582c3953
Plaintext      1
Ciphertext     0
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f68
Output Block   02ef5fc8961efcce8568bc0731262dc7
Plaintext      1
Ciphertext     1
Segment #10
Input Block    020406080a0c0e10121416181a1c1ed1
Output Block   9f5a30367065efbe914b53698c8716b7
Plaintext      1
Ciphertext     0
Segment #11
Input Block    04080c1014181c2024282c3034383da2
Output Block   d018cfb81d0580edbff955ed74d382db
Plaintext      0
Ciphertext     1
Segment #12
Input Block    08101820283038404850586068707b45
Output Block   81272ab351e08e0b695b94b8164d86f4
Plaintext      0
Ciphertext     1
Segment #13
Input Block    102030405060708090a0b0c0d0e0f68b
Output Block   094d33f856483d3fa01ba94f7e5ab3e7
Plaintext      0
Ciphertext     0
Segment #14
Input Block    20406080a0c0e10121416181a1c1ed16
Output Block   609900ad61923c8c102cd8d0d7947a2c
Plaintext      0
Ciphertext     0
Segment #15
Input Block    4080c1014181c2024282c3034383da2c
Output Block   9e5a154de966ab4db9c88b22a398134e
Plaintext      0
Ciphertext     1
Segment #16
Input Block    8101820283038404850586068707b459
Output Block   7fe16252b338bc4de3725c4156dfed20
Plaintext      1
Ciphertext     1

F.3.2 CFB1-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Ciphertext     0
Plaintext      0
Segment #2
Input Block    00020406080a0c0e10121416181a1c1e
Output Block   19cf576c7596e702f298b35666955c79
Ciphertext     1
Plaintext      1
Segment #3
Input Block    0004080c1014181c2024282c3034383d
Output Block   59e17759acd02b801fa321ea059e331f
Ciphertext     1
Plaintext      1
Segment #4
Input Block    0008101820283038404850586068707b
Output Block   71f415b0cc109e8b0faa14ab740c22f4
Ciphertext     0
Plaintext      0
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f6
Output Block   3fb76d3d1048179964597a0f64d5adad
Ciphertext     1
Plaintext      1
Segment #6
Input Block    0020406080a0c0e10121416181a1c1ed
Output Block   4c943b4bac54ab974e3e52326d29aaa1
Ciphertext     0
Plaintext      0
Segment #7
Input Block    004080c1014181c2024282c3034383da
Output Block   c94da41eb3d3acf1993a512ab1e8203f
Ciphertext     0
Plaintext      1
Segment #8
Input Block    008101820283038404850586068707b4
Output Block   e07f5e98778f75dbb2691c3f582c3953
Ciphertext     0
Plaintext      1
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f68
Output Block   02ef5fc8961efcce8568bc0731262dc7
Ciphertext     1
Plaintext      1
Segment #10
Input Block    020406080a0c0e10121416181a1c1ed1
Output Block   9f5a30367065efbe914b53698c8716b7
Ciphertext     0
Plaintext      1
Segment #11
Input Block    04080c1014181c2024282c3034383da2
Output Block   d018cfb81d0580edbff955ed74d382db
Ciphertext     1
Plaintext      0
Segment #12
Input Block    08101820283038404850586068707b45
Output Block   81272ab351e08e0b695b94b8164d86f4
Ciphertext     1
Plaintext      0
Segment #13
Input Block    102030405060708090a0b0c0d0e0f68b
Output Block   094d33f856483d3fa01ba94f7e5ab3e7
Ciphertext     0
Plaintext      0
Segment #14
Input Block    20406080a0c0e10121416181a1c1ed16
Output Block   609900ad61923c8c102cd8d0d7947a2c
Ciphertext     0
Plaintext      0
Segment #15
Input Block    4080c1014181c2024282c3034383da2c
Output Block   9e5a154de966ab4db9c88b22a398134e
Ciphertext     1
Plaintext      0
Segment #16
Input Block    8101820283038404850586068707b459
Output Block   7fe16252b338bc4de3725c4156dfed20
Ciphertext     1
Plaintext      1

F.3.3 CFB1-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Plaintext      0
Ciphertext     1
Segment #2
Input Block    00020406080a0c0e10121416181a1c1f
Output Block   a0e2bee6eb1734379bd4908be6a991a0
Plaintext      1
Ciphertext     0
Segment #3
Input Block    0004080c1014181c2024282c3034383e
Output Block   b1a1766bedec7ee3ba9cd3f34fbed4c6
Plaintext      1
Ciphertext     0
Segment #4
Input Block    0008101820283038404850586068707c
Output Block   b294ae5f393ae0179e6d3d8c45a7a4b9
Plaintext      0
Ciphertext     1
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f9
Output Block   f0f703ff5d0634aa8aee7f1e26aafca3
Plaintext      1
Ciphertext     0
Segment #6
Input Block    0020406080a0c0e10121416181a1c1f2
Output Block   4d67df426abdb8c89e7de9fb3069d8be
Plaintext      0
Ciphertext     0
Segment #7
Input Block    004080c1014181c2024282c3034383e4
Output Block   30bc892338dfa10664118b9f4ba348d2
Plaintext      1
Ciphertext     1
Segment #8
Input Block    008101820283038404850586068707c9
Output Block   763ad8c63ed78d66452bb44c8bb7a8c8
Plaintext      1
Ciphertext     1
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f93
Output Block   bfc36f5cfbc1306859b48f8fa62a43df
Plaintext      1
Ciphertext     0
Segment #10
Input Block    020406080a0c0e10121416181a1c1f26
Output Block   16e27adac112a0bf6a69c95cbdf584a3
Plaintext      1
Ciphertext     1
Segment #11
Input Block    04080c1014181c2024282c3034383e4d
Output Block   1e9d21c3da3de9186251160045756ce0
Plaintext      0
Ciphertext     0
Segment #12
Input Block    08101820283038404850586068707c9a
Output Block   b836e0f661b51d8bd38c448e0e5a11bb
Plaintext      0
Ciphertext     1
Segment #13
Input Block    102030405060708090a0b0c0d0e0f935
Output Block   c5efcdd09dbb92d1faada8f6c9bab052
Plaintext      0
Ciphertext     1
Segment #14
Input Block    20406080a0c0e10121416181a1c1f26b
Output Block   7c99710018d88e40bd4ac8f1b2bf4dbb
Plaintext      0
Ciphertext     0
Segment #15
Input Block    4080c1014181c2024282c3034383e4d6
Output Block   173bcd8b4dad60ae6646813fdcb81f5b
Plaintext      0
Ciphertext     0
Segment #16
Input Block    8101820283038404850586068707c9ac
Output Block   09844c6d2272d148d5af1c7bf01bb439
Plaintext      1
Ciphertext     1

F.3.4 CFB1-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Ciphertext     1
Plaintext      0
Segment #2
Input Block    00020406080a0c0e10121416181a1c1f
Output Block   a0e2bee6eb1734379bd4908be6a991a0
Ciphertext     0
Plaintext      1
Segment #3
Input Block    0004080c1014181c2024282c3034383e
Output Block   b1a1766bedec7ee3ba9cd3f34fbed4c6
Ciphertext     0
Plaintext      1
Segment #4
Input Block    0008101820283038404850586068707c
Output Block   b294ae5f393ae0179e6d3d8c45a7a4b9
Ciphertext     1
Plaintext      0
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f9
Output Block   f0f703ff5d0634aa8aee7f1e26aafca3
Ciphertext     0
Plaintext      1
Segment #6
Input Block    0020406080a0c0e10121416181a1c1f2
Output Block   4d67df426abdb8c89e7de9fb3069d8be
Ciphertext     0
Plaintext      0
Segment #7
Input Block    004080c1014181c2024282c3034383e4
Output Block   30bc892338dfa10664118b9f4ba348d2
Ciphertext     1
Plaintext      1
Segment #8
Input Block    008101820283038404850586068707c9
Output Block   763ad8c63ed78d66452bb44c8bb7a8c8
Ciphertext     1
Plaintext      1
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f93
Output Block   bfc36f5cfbc1306859b48f8fa62a43df
Ciphertext     0
Plaintext      1
Segment #10
Input Block    020406080a0c0e10121416181a1c1f26
Output Block   16e27adac112a0bf6a69c95cbdf584a3
Ciphertext     1
Plaintext      1
Segment #11
Input Block    04080c1014181c2024282c3034383e4d
Output Block   1e9d21c3da3de9186251160045756ce0
Ciphertext     0
Plaintext      0
Segment #12
Input Block    08101820283038404850586068707c9a
Output Block   b836e0f661b51d8bd38c448e0e5a11bb
Ciphertext     1
Plaintext      0
Segment #13
Input Block    102030405060708090a0b0c0d0e0f935
Output Block   c5efcdd09dbb92d1faada8f6c9bab052
Ciphertext     1
Plaintext      0
Segment #14
Input Block    20406080a0c0e10121416181a1c1f26b
Output Block   7c99710018d88e40bd4ac8f1b2bf4dbb
Ciphertext     0
Plaintext      0
Segment #15
Input Block    4080c1014181c2024282c3034383e4d6
Output Block   173bcd8b4dad60ae6646813fdcb81f5b
Ciphertext     0
Plaintext      0
Segment #16
Input Block    8101820283038404850586068707c9ac
Output Block   09844c6d2272d148d5af1c7bf01bb439
Ciphertext     1
Plaintext      1

F.3.5 CFB1-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Plaintext      0
Ciphertext     1
Segment #2
Input Block    00020406080a0c0e10121416181a1c1f
Output Block   ee93d380e0f01117fffd78017599514a
Plaintext      1
Ciphertext     0
Segment #3
Input Block    0004080c1014181c2024282c3034383e
Output Block   857749898b3602aad91e699911de89b0
Plaintext      1
Ciphertext     0
Segment #4
Input Block    0008101820283038404850586068707c
Output Block   dce81c80810e2ba343a6bb402716b7a8
Plaintext      0
Ciphertext     1
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f9
Output Block   e5517bfcdccea00501350a601f754823
Plaintext      1
Ciphertext     0
Segment #6
Input Block    0020406080a0c0e10121416181a1c1f2
Output Block   15799c7f4081a78cc41f29955349c5a0
Plaintext      0
Ciphertext     0
Segment #7
Input Block    004080c1014181c2024282c3034383e4
Output Block   84d246bdb391f6a7979ff5ccb8467262
Plaintext      1
Ciphertext     0
Segment #8
Input Block    008101820283038404850586068707c8
Output Block   bb9e05db9855a9e7e3837a648dd4c3b0
Plaintext      1
Ciphertext     0
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f90
Output Block   a413c5714f70287dfcd943004bf7ac8e
Plaintext      1
Ciphertext     0
Segment #10
Input Block    020406080a0c0e10121416181a1c1f20
Output Block   a7310abf87610d66edf6c892a84460d5
Plaintext      1
Ciphertext     0
Segment #11
Input Block    04080c1014181c2024282c3034383e40
Output Block   8aec6712d89bd147c83b51d787b11399
Plaintext      0
Ciphertext     1
Segment #12
Input Block    08101820283038404850586068707c81
Output Block   2ff05b620f68134f4ba92deffbfc93b2
Plaintext      0
Ciphertext     0
Segment #13
Input Block    102030405060708090a0b0c0d0e0f902
Output Block   819208afd5284316065a76bead028ad3
Plaintext      0
Ciphertext     1
Segment #14
Input Block    20406080a0c0e10121416181a1c1f205
Output Block   1914ed64b2115167ce2ca4c813da5245
Plaintext      0
Ciphertext     0
Segment #15
Input Block    4080c1014181c2024282c3034383e40a
Output Block   638abae8724a954ae9e1e2e119deb6e1
Plaintext      0
Ciphertext     0
Segment #16
Input Block    8101820283038404850586068707c814
Output Block   2b4f488a3f958c52a3f1db2da938360e
Plaintext      1
Ciphertext     1

F.3.6 CFB1-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Ciphertext     1
Plaintext      0
Segment #2
Input Block    00020406080a0c0e10121416181a1c1f
Output Block   ee93d380e0f01117fffd78017599514a
Ciphertext     0
Plaintext      1
Segment #3
Input Block    0004080c1014181c2024282c3034383e
Output Block   857749898b3602aad91e699911de89b0
Ciphertext     0
Plaintext      1
Segment #4
Input Block    0008101820283038404850586068707c
Output Block   dce81c80810e2ba343a6bb402716b7a8
Ciphertext     1
Plaintext      0
Segment #5
Input Block    00102030405060708090a0b0c0d0e0f9
Output Block   e5517bfcdccea00501350a601f754823
Ciphertext     0
Plaintext      1
Segment #6
Input Block    0020406080a0c0e10121416181a1c1f2
Output Block   15799c7f4081a78cc41f29955349c5a0
Ciphertext     0
Plaintext      0
Segment #7
Input Block    004080c1014181c2024282c3034383e4
Output Block   84d246bdb391f6a7979ff5ccb8467262
Ciphertext     0
Plaintext      1
Segment #8
Input Block    008101820283038404850586068707c8
Output Block   bb9e05db9855a9e7e3837a648dd4c3b0
Ciphertext     0
Plaintext      1
Segment #9
Input Block    0102030405060708090a0b0c0d0e0f90
Output Block   a413c5714f70287dfcd943004bf7ac8e
Ciphertext     0
Plaintext      1
Segment #10
Input Block    020406080a0c0e10121416181a1c1f20
Output Block   a7310abf87610d66edf6c892a84460d5
Ciphertext     0
Plaintext      1
Segment #11
Input Block    04080c1014181c2024282c3034383e40
Output Block   8aec6712d89bd147c83b51d787b11399
Ciphertext     1
Plaintext      0
Segment #12
Input Block    08101820283038404850586068707c81
Output Block   2ff05b620f68134f4ba92deffbfc93b2
Ciphertext     0
Plaintext      0
Segment #13
Input Block    102030405060708090a0b0c0d0e0f902
Output Block   819208afd5284316065a76bead028ad3
Ciphertext     1
Plaintext      0
Segment #14
Input Block    20406080a0c0e10121416181a1c1f205
Output Block   1914ed64b2115167ce2ca4c813da5245
Ciphertext     0
Plaintext      0
Segment #15
Input Block    4080c1014181c2024282c3034383e40a
Output Block   638abae8724a954ae9e1e2e119deb6e1
Ciphertext     0
Plaintext      0
Segment #16
Input Block    8101820283038404850586068707c814
Output Block   2b4f488a3f958c52a3f1db2da938360e
Ciphertext     1
Plaintext      1

F.3.7 CFB8-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Plaintext      6b
Ciphertext     3b
Segment #2
Input Block    0102030405060708090a0b0c0d0e0f3b
Output Block   b8eb865a2b026381abb1d6560ed20f68
Plaintext      c1
Ciphertext     79
Segment #3
Input Block    02030405060708090a0b0c0d0e0f3b79
Output Block   fce6033b4edce64cbaed3f61ff5b927c
Plaintext      be
Ciphertext     42
Segment #4
Input Block    030405060708090a0b0c0d0e0f3b7942
Output Block   ae4e5e7ffe805f7a4395b180004f8ca8
Plaintext      e2
Ciphertext     4c
Segment #5
Input Block    0405060708090a0b0c0d0e0f3b79424c
Output Block   b205eb89445b62116f1deb988a81e6dd
Plaintext      2e
Ciphertext     9c
Segment #6
Input Block    05060708090a0b0c0d0e0f3b79424c9c
Output Block   4d21d456a5e239064fff4be0c0f85488
Plaintext      40
Ciphertext     0d
Segment #7
Input Block    060708090a0b0c0d0e0f3b79424c9c0d
Output Block   4b2f5c3895b9efdc85ee0c5178c7fd33
Plaintext      9f
Ciphertext     d4
Segment #8
Input Block    0708090a0b0c0d0e0f3b79424c9c0dd4
Output Block   a0976d856da260a34104d1a80953db4c
Plaintext      96
Ciphertext     36
Segment #9
Input Block    08090a0b0c0d0e0f3b79424c9c0dd436
Output Block   53674e5890a2c71b0f6a27a094e5808c
Plaintext      e9
Ciphertext     ba
Segment #10
Input Block    090a0b0c0d0e0f3b79424c9c0dd436ba
Output Block   f34cd32ffed495f8bc8adba194eccb7a
Plaintext      3d
Ciphertext     ce
Segment #11
Input Block    0a0b0c0d0e0f3b79424c9c0dd436bace
Output Block   e08cf2407d7ed676c9049586f1d48ba6
Plaintext      7e
Ciphertext     9e
Segment #12
Input Block    0b0c0d0e0f3b79424c9c0dd436bace9e
Output Block   1f5c88a19b6ca28e99c9aeb8982a6dd8
Plaintext      11
Ciphertext     0e
Segment #13
Input Block    0c0d0e0f3b79424c9c0dd436bace9e0e
Output Block   a70e63df781cf395a208bd2365c8779b
Plaintext      73
Ciphertext     d4
Segment #14
Input Block    0d0e0f3b79424c9c0dd436bace9e0ed4
Output Block   cbcfe8b3bcf9ac202ce18420013319ab
Plaintext      93
Ciphertext     58
Segment #15
Input Block    0e0f3b79424c9c0dd436bace9e0ed458
Output Block   7d9fac6604b3c8c5b1f8c5a00956cf56
Plaintext      17
Ciphertext     6a
Segment #16
Input Block    0f3b79424c9c0dd436bace9e0ed4586a
Output Block   65c3fa64bf0343986825c636f4a1efd2
Plaintext      2a
Ciphertext     4f
Segment #17
Input Block    3b79424c9c0dd436bace9e0ed4586a4f
Output Block   9cff5e5ff4f554d56c924b9d6a6de21d
Plaintext      ae
Ciphertext     32
Segment #18
Input Block    79424c9c0dd436bace9e0ed4586a4f32
Output Block   946c3dc1584cc18400ecd8c6052c44b1
Plaintext      2d
Ciphertext     b9

F.3.8 CFB8-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Ciphertext     3b
Plaintext      6b
Segment #2
Input Block    0102030405060708090a0b0c0d0e0f3b
Output Block   b8eb865a2b026381abb1d6560ed20f68
Ciphertext     79
Plaintext      c1
Segment #3
Input Block    02030405060708090a0b0c0d0e0f3b79
Output Block   fce6033b4edce64cbaed3f61ff5b927c
Ciphertext     42
Plaintext      be
Segment #4
Input Block    030405060708090a0b0c0d0e0f3b7942
Output Block   ae4e5e7ffe805f7a4395b180004f8ca8
Ciphertext     4c
Plaintext      e2
Segment #5
Input Block    0405060708090a0b0c0d0e0f3b79424c
Output Block   b205eb89445b62116f1deb988a81e6dd
Ciphertext     9c
Plaintext      2e
Segment #6
Input Block    05060708090a0b0c0d0e0f3b79424c9c
Output Block   4d21d456a5e239064fff4be0c0f85488
Ciphertext     0d
Plaintext      40
Segment #7
Input Block    060708090a0b0c0d0e0f3b79424c9c0d
Output Block   4b2f5c3895b9efdc85ee0c5178c7fd33
Ciphertext     d4
Plaintext      9f
Segment #8
Input Block    0708090a0b0c0d0e0f3b79424c9c0dd4
Output Block   a0976d856da260a34104d1a80953db4c
Ciphertext     36
Plaintext      96
Segment #9
Input Block    08090a0b0c0d0e0f3b79424c9c0dd436
Output Block   53674e5890a2c71b0f6a27a094e5808c
Ciphertext     ba
Plaintext      e9
Segment #10
Input Block    090a0b0c0d0e0f3b79424c9c0dd436ba
Output Block   f34cd32ffed495f8bc8adba194eccb7a
Ciphertext     ce
Plaintext      3d
Segment #11
Input Block    0a0b0c0d0e0f3b79424c9c0dd436bace
Output Block   e08cf2407d7ed676c9049586f1d48ba6
Ciphertext     9e
Plaintext      7e
Segment #12
Input Block    0b0c0d0e0f3b79424c9c0dd436bace9e
Output Block   1f5c88a19b6ca28e99c9aeb8982a6dd8
Ciphertext     0e
Plaintext      11
Segment #13
Input Block    0c0d0e0f3b79424c9c0dd436bace9e0e
Output Block   a70e63df781cf395a208bd2365c8779b
Ciphertext     d4
Plaintext      73
Segment #14
Input Block    0d0e0f3b79424c9c0dd436bace9e0ed4
Output Block   cbcfe8b3bcf9ac202ce18420013319ab
Ciphertext     58
Plaintext      93
Segment #15
Input Block    0e0f3b79424c9c0dd436bace9e0ed458
Output Block   7d9fac6604b3c8c5b1f8c5a00956cf56
Ciphertext     6a
Plaintext      17
Segment #16
Input Block    0f3b79424c9c0dd436bace9e0ed4586a
Output Block   65c3fa64bf0343986825c636f4a1efd2
Ciphertext     4f
Plaintext      2a
Segment #17
Input Block    3b79424c9c0dd436bace9e0ed4586a4f
Output Block   9cff5e5ff4f554d56c924b9d6a6de21d
Ciphertext     32
Plaintext      ae
Segment #18
Input Block    79424c9c0dd436bace9e0ed4586a4f32
Output Block   946c3dc1584cc18400ecd8c6052c44b1
Ciphertext     b9
Plaintext      2d

F.3.9 CFB8-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Plaintext      6b
Ciphertext     cd
Segment #2
Input Block    0102030405060708090a0b0c0d0e0fcd
Output Block   63c82e99e7289617c49e6851e082142a
Plaintext      c1
Ciphertext     a2
Segment #3
Input Block    02030405060708090a0b0c0d0e0fcda2
Output Block   ec40a5497264bfb4d6820aaae73f75af
Plaintext      be
Ciphertext     52
Segment #4
Input Block    030405060708090a0b0c0d0e0fcda252
Output Block   fc011a96afe968c32bae6495173a9154
Plaintext      e2
Ciphertext     1e
Segment #5
Input Block    0405060708090a0b0c0d0e0fcda2521e
Output Block   de019e09ac995ba46a42916ef77d8fe5
Plaintext      2e
Ciphertext     f0
Segment #6
Input Block    05060708090a0b0c0d0e0fcda2521ef0
Output Block   e980477efb7f896e07c4a2d527e7b537
Plaintext      40
Ciphertext     a9
Segment #7
Input Block    060708090a0b0c0d0e0fcda2521ef0a9
Output Block   9a9a77b11709b36e08e9321ae8b1e539
Plaintext      9f
Ciphertext     05
Segment #8
Input Block    0708090a0b0c0d0e0fcda2521ef0a905
Output Block   5ca1d192a780fbca1471e10588593c7c
Plaintext      96
Ciphertext     ca
Segment #9
Input Block    08090a0b0c0d0e0fcda2521ef0a905ca
Output Block   addb26efd21de4d002474c7748e0bc1d
Plaintext      e9
Ciphertext     44
Segment #10
Input Block    090a0b0c0d0e0fcda2521ef0a905ca44
Output Block   f0c410ad6512c5177a5ee40a60de01b8
Plaintext      3d
Ciphertext     cd
Segment #11
Input Block    0a0b0c0d0e0fcda2521ef0a905ca44cd
Output Block   7bbf71f2b4f5cf68f3c0c1b9235dbd53
Plaintext      7e
Ciphertext     05
Segment #12
Input Block    0b0c0d0e0fcda2521ef0a905ca44cd05
Output Block   6dafb26e3c63b350811394b382e14d69
Plaintext      11
Ciphertext     7c
Segment #13
Input Block    0c0d0e0fcda2521ef0a905ca44cd057c
Output Block   ccd6e25255a80e9bdbec9fbc26e5fad6
Plaintext      73
Ciphertext     bf
Segment #14
Input Block    0d0e0fcda2521ef0a905ca44cd057cbf
Output Block   9e33550f6d47bda77f4f3108181ab21c
Plaintext      93
Ciphertext     0d
Segment #15
Input Block    0e0fcda2521ef0a905ca44cd057cbf0d
Output Block   50b3eae29a6623fbef6d726dbda675a8
Plaintext      17
Ciphertext     47
Segment #16
Input Block    0fcda2521ef0a905ca44cd057cbf0d47
Output Block   8a2a57d1b9158539ef7ff42b33bf0a4a
Plaintext      2a
Ciphertext     a0
Segment #17
Input Block    cda2521ef0a905ca44cd057cbf0d47a0
Output Block   c94e9102ac731d2f127b657d810ef5a8
Plaintext      ae
Ciphertext     67
Segment #18
Input Block    a2521ef0a905ca44cd057cbf0d47a067
Output Block   a765ed650568fbe386660def5f8d491d
Plaintext      2d
Ciphertext     8a

F.3.10 CFB8-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Ciphertext     cd
Plaintext      6b
Segment #2
Input Block    0102030405060708090a0b0c0d0e0fcd
Output Block   63c82e99e7289617c49e6851e082142a
Ciphertext     a2
Plaintext      c1
Segment #3
Input Block    02030405060708090a0b0c0d0e0fcda2
Output Block   ec40a5497264bfb4d6820aaae73f75af
Ciphertext     52
Plaintext      be
Segment #4
Input Block    030405060708090a0b0c0d0e0fcda252
Output Block   fc011a96afe968c32bae6495173a9154
Ciphertext     1e
Plaintext      e2
Segment #5
Input Block    0405060708090a0b0c0d0e0fcda2521e
Output Block   de019e09ac995ba46a42916ef77d8fe5
Ciphertext     f0
Plaintext      2e
Segment #6
Input Block    05060708090a0b0c0d0e0fcda2521ef0
Output Block   e980477efb7f896e07c4a2d527e7b537
Ciphertext     a9
Plaintext      40
Segment #7
Input Block    060708090a0b0c0d0e0fcda2521ef0a9
Output Block   9a9a77b11709b36e08e9321ae8b1e539
Ciphertext     05
Plaintext      9f
Segment #8
Input Block    0708090a0b0c0d0e0fcda2521ef0a905
Output Block   5ca1d192a780fbca1471e10588593c7c
Ciphertext     ca
Plaintext      96
Segment #9
Input Block    08090a0b0c0d0e0fcda2521ef0a905ca
Output Block   addb26efd21de4d002474c7748e0bc1d
Ciphertext     44
Plaintext      e9
Segment #10
Input Block    090a0b0c0d0e0fcda2521ef0a905ca44
Output Block   f0c410ad6512c5177a5ee40a60de01b8
Ciphertext     cd
Plaintext      3d
Segment #11
Input Block    0a0b0c0d0e0fcda2521ef0a905ca44cd
Output Block   7bbf71f2b4f5cf68f3c0c1b9235dbd53
Ciphertext     05
Plaintext      7e
Segment #12
Input Block    0b0c0d0e0fcda2521ef0a905ca44cd05
Output Block   6dafb26e3c63b350811394b382e14d69
Ciphertext     7c
Plaintext      11
Segment #13
Input Block    0c0d0e0fcda2521ef0a905ca44cd057c
Output Block   ccd6e25255a80e9bdbec9fbc26e5fad6
Ciphertext     bf
Plaintext      73
Segment #14
Input Block    0d0e0fcda2521ef0a905ca44cd057cbf
Output Block   9e33550f6d47bda77f4f3108181ab21c
Ciphertext     0d
Plaintext      93
Segment #15
Input Block    0e0fcda2521ef0a905ca44cd057cbf0d
Output Block   50b3eae29a6623fbef6d726dbda675a8
Ciphertext     47
Plaintext      17
Segment #16
Input Block    0fcda2521ef0a905ca44cd057cbf0d47
Output Block   8a2a57d1b9158539ef7ff42b33bf0a4a
Ciphertext     a0
Plaintext      2a
Segment #17
Input Block    cda2521ef0a905ca44cd057cbf0d47a0
Output Block   c94e9102ac731d2f127b657d810ef5a8
Ciphertext     67
Plaintext      ae
Segment #18
Input Block    a2521ef0a905ca44cd057cbf0d47a067
Output Block   a765ed650568fbe386660def5f8d491d
Ciphertext     8a
Plaintext      2d

F.3.11 CFB8-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Plaintext      6b
Ciphertext     dc
Segment #2
Input Block    0102030405060708090a0b0c0d0e0fdc
Output Block   ded5faadb1068af80e774684b9f84870
Plaintext      c1
Ciphertext     1f
Segment #3
Input Block    02030405060708090a0b0c0d0e0fdc1f
Output Block   a41e327e5273366ce9403cdbdb92c1cc
Plaintext      be
Ciphertext     1a
Segment #4
Input Block    030405060708090a0b0c0d0e0fdc1f1a
Output Block   67938ae7d34df4ec2c0aec33eb98318f
Plaintext      e2
Ciphertext     85
Segment #5
Input Block    0405060708090a0b0c0d0e0fdc1f1a85
Output Block   0e8f2e31efff615d3c93946609808c37
Plaintext      2e
Ciphertext     20
Segment #6
Input Block    05060708090a0b0c0d0e0fdc1f1a8520
Output Block   e648bb37a95c94c72784162a79dfe306
Plaintext      40
Ciphertext     a6
Segment #7
Input Block    060708090a0b0c0d0e0fdc1f1a8520a6
Output Block   d278f3147290fc5dd0b7d2e82764a1fd
Plaintext      9f
Ciphertext     4d
Segment #8
Input Block    0708090a0b0c0d0e0fdc1f1a8520a64d
Output Block   2388d255a3e8a8059675e3a7de19dceb
Plaintext      96
Ciphertext     b5
Segment #9
Input Block    08090a0b0c0d0e0fdc1f1a8520a64db5
Output Block   b6b8008f6c6dc2d6144641ed2023f0f5
Plaintext      e9
Ciphertext     5f
Segment #10
Input Block    090a0b0c0d0e0fdc1f1a8520a64db55f
Output Block   f18f88a7aa3e3a6167dd93fb1137713a
Plaintext      3d
Ciphertext     cc
Segment #11
Input Block    0a0b0c0d0e0fdc1f1a8520a64db55fcc
Output Block   f46c5e67bff7c070b26c0318c52d0ccd
Plaintext      7e
Ciphertext     8a
Segment #12
Input Block    0b0c0d0e0fdc1f1a8520a64db55fcc8a
Output Block   d4dceae622f8f21d27375d8c2c5f9fba
Plaintext      11
Ciphertext     c5
Segment #13
Input Block    0c0d0e0fdc1f1a8520a64db55fcc8ac5
Output Block   27e9e0d0a016709cd3ae0b5a9a242e31
Plaintext      73
Ciphertext     54
Segment #14
Input Block    0d0e0fdc1f1a8520a64db55fcc8ac554
Output Block   17f69d50ce64ba0d085de70b9030bbb2
Plaintext      93
Ciphertext     84
Segment #15
Input Block    0e0fdc1f1a8520a64db55fcc8ac55484
Output Block   59106ee400d18e104337669628c33cdd
Plaintext      17
Ciphertext     4e
Segment #16
Input Block    0fdc1f1a8520a64db55fcc8ac554844e
Output Block   a29c6ac87e2245ec0796772c1f5312a8
Plaintext      2a
Ciphertext     88
Segment #17
Input Block    dc1f1a8520a64db55fcc8ac554844e88
Output Block   397b98fa2ec0ff8cc0cd821909551c9e
Plaintext      ae
Ciphertext     97
Segment #18
Input Block    1f1a8520a64db55fcc8ac554844e8897
Output Block   2d2d6fe9aef72f7b914b623a9c7abd54
Plaintext      2d
Ciphertext     00

F.3.12 CFB8-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Ciphertext     dc
Plaintext      6b
Segment #2
Input Block    0102030405060708090a0b0c0d0e0fdc
Output Block   ded5faadb1068af80e774684b9f84870
Ciphertext     1f
Plaintext      c1
Segment #3
Input Block    02030405060708090a0b0c0d0e0fdc1f
Output Block   a41e327e5273366ce9403cdbdb92c1cc
Ciphertext     1a
Plaintext      be
Segment #4
Input Block    030405060708090a0b0c0d0e0fdc1f1a
Output Block   67938ae7d34df4ec2c0aec33eb98318f
Ciphertext     85
Plaintext      e2
Segment #5
Input Block    0405060708090a0b0c0d0e0fdc1f1a85
Output Block   0e8f2e31efff615d3c93946609808c37
Ciphertext     20
Plaintext      2e
Segment #6
Input Block    05060708090a0b0c0d0e0fdc1f1a8520
Output Block   e648bb37a95c94c72784162a79dfe306
Ciphertext     a6
Plaintext      40
Segment #7
Input Block    060708090a0b0c0d0e0fdc1f1a8520a6
Output Block   d278f3147290fc5dd0b7d2e82764a1fd
Ciphertext     4d
Plaintext      9f
Segment #8
Input Block    0708090a0b0c0d0e0fdc1f1a8520a64d
Output Block   2388d255a3e8a8059675e3a7de19dceb
Ciphertext     b5
Plaintext      96
Segment #9
Input Block    08090a0b0c0d0e0fdc1f1a8520a64db5
Output Block   b6b8008f6c6dc2d6144641ed2023f0f5
Ciphertext     5f
Plaintext      e9
Segment #10
Input Block    090a0b0c0d0e0fdc1f1a8520a64db55f
Output Block   f18f88a7aa3e3a6167dd93fb1137713a
Ciphertext     cc
Plaintext      3d
Segment #11
Input Block    0a0b0c0d0e0fdc1f1a8520a64db55fcc
Output Block   f46c5e67bff7c070b26c0318c52d0ccd
Ciphertext     8a
Plaintext      7e
Segment #12
Input Block    0b0c0d0e0fdc1f1a8520a64db55fcc8a
Output Block   d4dceae622f8f21d27375d8c2c5f9fba
Ciphertext     c5
Plaintext      11
Segment #13
Input Block    0c0d0e0fdc1f1a8520a64db55fcc8ac5
Output Block   27e9e0d0a016709cd3ae0b5a9a242e31
Ciphertext     54
Plaintext      73
Segment #14
Input Block    0d0e0fdc1f1a8520a64db55fcc8ac554
Output Block   17f69d50ce64ba0d085de70b9030bbb2
Ciphertext     84
Plaintext      93
Segment #15
Input Block    0e0fdc1f1a8520a64db55fcc8ac55484
Output Block   59106ee400d18e104337669628c33cdd
Ciphertext     4e
Plaintext      17
Segment #16
Input Block    0fdc1f1a8520a64db55fcc8ac554844e
Output Block   a29c6ac87e2245ec0796772c1f5312a8
Ciphertext     88
Plaintext      2a
Segment #17
Input Block    dc1f1a8520a64db55fcc8ac554844e88
Output Block   397b98fa2ec0ff8cc0cd821909551c9e
Ciphertext     97
Plaintext      ae
Segment #18
Input Block    1f1a8520a64db55fcc8ac554844e8897
Output Block   2d2d6fe9aef72f7b914b623a9c7abd54
Ciphertext     00
Plaintext      2d

F.3.13 CFB128-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     3b3fd92eb72dad20333449f8e83cfb4a
Segment #2
Input Block    3b3fd92eb72dad20333449f8e83cfb4a
Output Block   668bcf60beb005a35354a201dab36bda
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     c8a64537a0b3a93fcde3cdad9f1ce58b
Segment #3
Input Block    c8a64537a0b3a93fcde3cdad9f1ce58b
Output Block   16bd032100975551547b4de89daea630
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     26751f67a3cbb140b1808cf187a4f4df
Segment #4
Input Block    26751f67a3cbb140b1808cf187a4f4df
Output Block   36d42170a312871947ef8714799bc5f6
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     c04b05357c5d1c0eeac4c66f9ff7f2e6

F.3.14 CFB128-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Ciphertext     3b3fd92eb72dad20333449f8e83cfb4a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Segment #2
Input Block    3b3fd92eb72dad20333449f8e83cfb4a
Output Block   668bcf60beb005a35354a201dab36bda
Ciphertext     c8a64537a0b3a93fcde3cdad9f1ce58b
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Segment #3
Input Block    c8a64537a0b3a93fcde3cdad9f1ce58b
Output Block   16bd032100975551547b4de89daea630
Ciphertext     26751f67a3cbb140b1808cf187a4f4df
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Segment #4
Input Block    26751f67a3cbb140b1808cf187a4f4df
Output Block   36d42170a312871947ef8714799bc5f6
Ciphertext     c04b05357c5d1c0eeac4c66f9ff7f2e6
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.3.15 CFB128-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     cdc80d6fddf18cab34c25909c99a4174
Segment #2
Input Block    cdc80d6fddf18cab34c25909c99a4174
Output Block   c9e3f5289f149abd08ad44dc52b2b32b
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     67ce7f7f81173621961a2b70171d3d7a
Segment #3
Input Block    67ce7f7f81173621961a2b70171d3d7a
Output Block   1ed6965b76c76ca02d1dcef404f09626
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     2e1e8a1dd59b88b1c8e60fed1efac4c9
Segment #4
Input Block    2e1e8a1dd59b88b1c8e60fed1efac4c9
Output Block   36c0bbd976ccd4b7ef85cec1be273eef
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     c05f9f9ca9834fa042ae8fba584b09ff

F.3.16 CFB128-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Ciphertext     cdc80d6fddf18cab34c25909c99a4174
Plaintext      6bc1bee22e409f96e93d7e117393172a
Segment #2
Input Block    cdc80d6fddf18cab34c25909c99a4174
Output Block   c9e3f5289f149abd08ad44dc52b2b32b
Ciphertext     67ce7f7f81173621961a2b70171d3d7a
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Segment #3
Input Block    67ce7f7f81173621961a2b70171d3d7a
Output Block   1ed6965b76c76ca02d1dcef404f09626
Ciphertext     2e1e8a1dd59b88b1c8e60fed1efac4c9
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Segment #4
Input Block    2e1e8a1dd59b88b1c8e60fed1efac4c9
Output Block   36c0bbd976ccd4b7ef85cec1be273eef
Ciphertext     c05f9f9ca9834fa042ae8fba584b09ff
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.3.17 CFB128-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     dc7e84bfda79164b7ecd8486985d3860
Segment #2
Input Block    dc7e84bfda79164b7ecd8486985d3860
Output Block   97d26743252b1d54aca653cf744ace2a
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     39ffed143b28b1c832113c6331e5407b
Segment #3
Input Block    39ffed143b28b1c832113c6331e5407b
Output Block   efd80f62b6b9af8344c511b13c70b016
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     df10132415e54b92a13ed0a8267ae2f9
Segment #4
Input Block    df10132415e54b92a13ed0a8267ae2f9
Output Block   833ca131c5f655ef8d1a2346b3ddd361
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     75a385741ab9cef82031623d55b1e471

F.3.18 CFB128-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Segment #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Ciphertext     dc7e84bfda79164b7ecd8486985d3860
Plaintext      6bc1bee22e409f96e93d7e117393172a
Segment #2
Input Block    dc7e84bfda79164b7ecd8486985d3860
Output Block   97d26743252b1d54aca653cf744ace2a
Ciphertext     39ffed143b28b1c832113c6331e5407b
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Segment #3
Input Block    39ffed143b28b1c832113c6331e5407b
Output Block   efd80f62b6b9af8344c511b13c70b016
Ciphertext     df10132415e54b92a13ed0a8267ae2f9
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Segment #4
Input Block    df10132415e54b92a13ed0a8267ae2f9
Output Block   833ca131c5f655ef8d1a2346b3ddd361
Ciphertext     75a385741ab9cef82031623d55b1e471
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.4 OFB Example Vectors

F.4.1 OFB-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     3b3fd92eb72dad20333449f8e83cfb4a
Block #2
Input Block    50fe67cc996d32b6da0937e99bafec60
Output Block   d9a4dada0892239f6b8b3d7680e15674
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     7789508d16918f03f53c52dac54ed825
Block #3
Input Block    d9a4dada0892239f6b8b3d7680e15674
Output Block   a78819583f0308e7a6bf36b1386abf23
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     9740051e9c5fecf64344f7a82260edcc
Block #4
Input Block    a78819583f0308e7a6bf36b1386abf23
Output Block   c6d3416d29165c6fcb8e51a227ba994e
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     304c6528f659c77866a510d9c1d6ae5e

F.4.2 OFB-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   50fe67cc996d32b6da0937e99bafec60
Ciphertext     3b3fd92eb72dad20333449f8e83cfb4a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    50fe67cc996d32b6da0937e99bafec60
Output Block   d9a4dada0892239f6b8b3d7680e15674
Ciphertext     7789508d16918f03f53c52dac54ed825
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    d9a4dada0892239f6b8b3d7680e15674
Output Block   a78819583f0308e7a6bf36b1386abf23
Ciphertext     9740051e9c5fecf64344f7a82260edcc
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    a78819583f0308e7a6bf36b1386abf23
Output Block   c6d3416d29165c6fcb8e51a227ba994e
Ciphertext     304c6528f659c77866a510d9c1d6ae5e
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.4.3 OFB-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     cdc80d6fddf18cab34c25909c99a4174
Block #2
Input Block    a609b38df3b1133dddff2718ba09565e
Output Block   52ef01da52602fe0975f78ac84bf8a50
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     fcc28b8d4c63837c09e81700c1100401
Block #3
Input Block    52ef01da52602fe0975f78ac84bf8a50
Output Block   bd5286ac63aabd7eb067ac54b553f71d
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     8d9a9aeac0f6596f559c6d4daf59a5f2
Block #4
Input Block    bd5286ac63aabd7eb067ac54b553f71d
Output Block   9b00044d8885f729318713303fc0fe3a
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     6d9f200857ca6c3e9cac524bd9acc92a

F.4.4 OFB-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   a609b38df3b1133dddff2718ba09565e
Ciphertext     cdc80d6fddf18cab34c25909c99a4174
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    a609b38df3b1133dddff2718ba09565e
Output Block   52ef01da52602fe0975f78ac84bf8a50
Ciphertext     fcc28b8d4c63837c09e81700c1100401
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    52ef01da52602fe0975f78ac84bf8a50
Output Block   bd5286ac63aabd7eb067ac54b553f71d
Ciphertext     8d9a9aeac0f6596f559c6d4daf59a5f2
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    bd5286ac63aabd7eb067ac54b553f71d
Output Block   9b00044d8885f729318713303fc0fe3a
Ciphertext     6d9f200857ca6c3e9cac524bd9acc92a
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.4.5 OFB-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     dc7e84bfda79164b7ecd8486985d3860
Block #2
Input Block    b7bf3a5df43989dd97f0fa97ebce2f4a
Output Block   e1c656305ed1a7a6563805746fe03edc
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     4febdc6740d20b3ac88f6ad82a4fb08d
Block #3
Input Block    e1c656305ed1a7a6563805746fe03edc
Output Block   41635be625b48afc1666dd42a09d96e7
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     71ab47a086e86eedf39d1c5bba97c408
Block #4
Input Block    41635be625b48afc1666dd42a09d96e7
Output Block   f7b93058b8bce0fffea41bf0012cd394
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     0126141d67f37be8538f5a8be740e484

F.4.6 OFB-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
IV             000102030405060708090a0b0c0d0e0f
Block #1
Input Block    000102030405060708090a0b0c0d0e0f
Output Block   b7bf3a5df43989dd97f0fa97ebce2f4a
Ciphertext     dc7e84bfda79164b7ecd8486985d3860
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    b7bf3a5df43989dd97f0fa97ebce2f4a
Output Block   e1c656305ed1a7a6563805746fe03edc
Ciphertext     4febdc6740d20b3ac88f6ad82a4fb08d
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    e1c656305ed1a7a6563805746fe03edc
Output Block   41635be625b48afc1666dd42a09d96e7
Ciphertext     71ab47a086e86eedf39d1c5bba97c408
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    41635be625b48afc1666dd42a09d96e7
Output Block   f7b93058b8bce0fffea41bf0012cd394
Ciphertext     0126141d67f37be8538f5a8be740e484
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.5 CTR Example Vectors

F.5.1 CTR-AES128.Encrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   ec8cdf7398607cb0f2d21675ea9ea1e4
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     874d6191b620e3261bef6864990db6ce
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   362b7c3c6773516318a077d7fc5073ae
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     9806f66b7970fdff8617187bb9fffdff
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   6a2cc3787889374fbeb4c81b17ba6c44
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     5ae4df3edbd5d35e5b4f09020db03eab
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   e89c399ff0f198c6d40a31db156cabfe
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     1e031dda2fbe03d1792170a0f3009cee

F.5.2 CTR-AES128.Decrypt

Key            2b7e151628aed2a6abf7158809cf4f3c
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   ec8cdf7398607cb0f2d21675ea9ea1e4
Ciphertext     874d6191b620e3261bef6864990db6ce
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   362b7c3c6773516318a077d7fc5073ae
Ciphertext     9806f66b7970fdff8617187bb9fffdff
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   6a2cc3787889374fbeb4c81b17ba6c44
Ciphertext     5ae4df3edbd5d35e5b4f09020db03eab
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   e89c399ff0f198c6d40a31db156cabfe
Ciphertext     1e031dda2fbe03d1792170a0f3009cee
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.5.3 CTR-AES192.Encrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   717d2dc639128334a6167a488ded7921
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     1abc932417521ca24f2b0459fe7e6e0b
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   a72eb3bb14a556734b7bad6ab16100c5
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     090339ec0aa6faefd5ccc2c6f4ce8e94
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   2efeae2d72b722613446dc7f4c2af918
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     1e36b26bd1ebc670d1bd1d665620abf7
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   b9e783b30dd7924ff7bc9b97beaa8740
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     4f78a7f6d29809585a97daec58c6b050

F.5.4 CTR-AES192.Decrypt

Key            8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   717d2dc639128334a6167a488ded7921
Ciphertext     1abc932417521ca24f2b0459fe7e6e0b
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   a72eb3bb14a556734b7bad6ab16100c5
Ciphertext     090339ec0aa6faefd5ccc2c6f4ce8e94
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   2efeae2d72b722613446dc7f4c2af918
Ciphertext     1e36b26bd1ebc670d1bd1d665620abf7
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   b9e783b30dd7924ff7bc9b97beaa8740
Ciphertext     4f78a7f6d29809585a97daec58c6b050
Plaintext      f69f2445df4f9b17ad2b417be66c3710

F.5.5 CTR-AES256.Encrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   0bdf7df1591716335e9a8b15c860c502
Plaintext      6bc1bee22e409f96e93d7e117393172a
Ciphertext     601ec313775789a5b7a7f504bbf3d228
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   5a6e699d536119065433863c8f657b94
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Ciphertext     f443e3ca4d62b59aca84e990cacaf5c5
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   1bc12c9c01610d5d0d8bd6a3378eca62
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Ciphertext     2b0930daa23de94ce87017ba2d84988d
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   2956e1c8693536b1bee99c73a31576b6
Plaintext      f69f2445df4f9b17ad2b417be66c3710
Ciphertext     dfc9c58db67aada613c2dd08457941a6

F.5.6 CTR-AES256.Decrypt

Key            603deb1015ca71be2b73aef0857d7781
               1f352c073b6108d72d9810a30914dff4
Init. Counter  f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Block #1
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
Output Block   0bdf7df1591716335e9a8b15c860c502
Ciphertext     601ec313775789a5b7a7f504bbf3d228
Plaintext      6bc1bee22e409f96e93d7e117393172a
Block #2
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff00
Output Block   5a6e699d536119065433863c8f657b94
Ciphertext     f443e3ca4d62b59aca84e990cacaf5c5
Plaintext      ae2d8a571e03ac9c9eb76fac45af8e51
Block #3
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff01
Output Block   1bc12c9c01610d5d0d8bd6a3378eca62
Ciphertext     2b0930daa23de94ce87017ba2d84988d
Plaintext      30c81c46a35ce411e5fbc1191a0a52ef
Block #4
Input Block    f0f1f2f3f4f5f6f7f8f9fafbfcfdff02
Output Block   2956e1c8693536b1bee99c73a31576b6
Ciphertext     dfc9c58db67aada613c2dd08457941a6
Plaintext      f69f2445df4f9b17ad2b417be66c3710

Appendix G: References

[1] American National Standard for Financial Services X9.52-1998, “Triple Data Encryption Algorithm Modes of Operation.” American Bankers Association, Washington, D.C., July 29, 1998.

[2] FIPS Publication 197, “Advanced Encryption Standard (AES).” U.S. DoC/NIST, November 26, 2001.

[3] FIPS Publication 46-3, “Data Encryption Standard (DES).” U.S. DoC/NIST, October 25, 1999.

[4] FIPS Publication 81, “DES Modes of Operation.” U.S. DoC/NIST, December 1980.

[5] A. Menezes, P. van Oorschot, and S. Vanstone, “Handbook of Applied Cryptography.” CRC Press, New York, 1997.

Transcription and HTML by Cryptome.

Mode	Effect of Bit Errors in C_j	Effect of Bit Errors in the IV
ECB	RBE in the decryption of C_j	Not applicable
CBC	RBE in the decryption of C_j SBE in the decryption of C_j₊₁	SBE in the decryption of C₁
CFB	SBE in the decryption of C_j RBE in the decryption of C_j₊₁ ,…,C_j_+b/s	RBE in the decryption of C₁, C₂, …, C_j for some j between 1 and b/s
OFB	SBE in the decryption of C_j	RBE in the decryption of C₁, C₂, …, C_n
CTR	SBE in the decryption of C_j	Not applicable *

Recommendation for Block Cipher Modes of Operation

Methods and Techniques

Table of Contents

Table of Figures

Recommendation for Block
Cipher Modes of Operation