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4 December 1999

The Department of Defense offers some 100,000 of its standards, handbooks and specifications at:

http://assist.daps.mil

Go to Quick Search and drop down the FSC/Area menu for dozens of categories from nukes to explosives to communications security to whatever nat-sec pork allures. None of the accessible docs are classified, though some inaccessible require a pwd.

We found docs there we've been looking for a couple of years, though in huge multi-MB PDF files. We were pleased to find much TEMPEST info there, some NSA refused to release under FOIA.

There is buried in several of the docs a specification from (Secret) NSA 65-6 on TEMPEST protection levels, charts, details on exactly how to do it, or do it back when the docs were prepared*.

Having spent many hours downloading, we might, only might, put together a CD on mil-grade TEMPEST protection for facilities. Now that there are far better ways to get around EMSEC through human persuasion.

Maybe the site will become restricted at some point. For now it's a  good source to build your digital domprep library.

* See:

MIL-HDBK-232 -- Red/Black Engineering-Installation Guidelines

MIL-HDBK-411A -- Long Haul Communications (DCS), Power and Environmental Control for Physical Plant

MIL-HDBK-419 -- Grounding, Bonding, and Shielding for Electronic Equipments and Facilities

MIL-HDBK-1195 -- Radio Frequency Shielded Encosures

MIL-STD-188/124B -- Grounding, Bonding, and Shielding for Common Long Haul/Tactical Communications Systems

MIL-STD-188/125 (Series) HEMP Protection

MIL-STD-285 -- Attentuation Measurement for Enclosures, Electromagnetic Shielding, for Electronic Test Purposes, Method of

MIL-STD-461E -- Electromagnetic Interference Characteristics (Replaces previous 461 and 462)

Note: Quick Search is sensitive to exact alphanumerics. If you can't find what you're looking for try truncated versions, say, "MIL-STD-188" in lieu of "MIL-STD-188/124."

We found many listings by entering "electro" in the title slot, then searching the FSCs one at a time. "Electro" without category limit will get you about 50,000 listings -- the whole military toolkit is electro-besotted, it seems, and could be defeated with a strategic Tesla blit of the EM spectrum. What's a blit you ask?

Source: MIL-HDBK-1195 -- Radio Frequency Shielded Enclosures, September 30, 1988

[Excerpts]

Electromagnetic Interference (EMI) is a description of the phenomenon which results from allowing conducted and radiated electrical signals to reach destinations where their presence is undesirable. Uncontrolled EMI may cause computer malfunction or error, detonation of electrically explosive devices, or be the csuse for loss of classified information to an enemy. The objective of this handbook is to provide a basic understanding of the problems associated with the acquisition of a facility containing one or more EMI shielded enclosures. It is intended that only the characteristics of the facility that are unusual in comparison to a nonshielded facility will be addressed. This handbook is a brief introduction to EMI shielding theory and presents its basic criteria of importance during the planning, design, and construction of a typical facility containing an EMI shielded enclosure. One of the most critical shielding programs is the TEMPEST program. TEMPEST shielding may be required in facilities that house communication-electronics (C-E) equipment that process classified information. Facilities which contain this type of equipment must conform to the policies and regulation contained in OPNAVINST C5510.93, and to the appropriate National Security Agency COMSEC Publications. The shielding effectiveness (SE) requirements include both attenuation and frequency for the TEMPEST shield and should be contained in the BESEP. In the absence of defined frequency and shielding effectiveness limits in the BESEP, the cost estimate and construction techniques for the shield should provide for the shielding effectiveness defined in NSA 65-6, with the shielding effectiveness versus frequency as shown in Figure 15 and power filter insertion loss shown in Figure 10.

Shielding performance (SE) requirements for other than TEMPEST shielding should also be similarly identified in the specification. Merely stating thst MIL-STD-285 testing is required will result in a lower frequency measurement of magnetic field SE between 150 to 200 kHz with a limit of 70 dB SE, and a plane wave upper frequency measurement at 400 MHz with a limit of 100 dB of SE. Test point locations required must also be clearly identified in the specification. MIL-STD-285 is still useful in defining the test arrangement for antennas, including distances from source and receiving antennas from the shielding, and from each other during the reference reading along with the polarization of the antennas, including required probing with the receiving antenna during the performance measurements. Specifying NSA 65-6 performance testing will result in test frequencies of 1 kHz, 10 kHz, 100 kHz and 1 MHz magnetic field and electric field, 10 MHz electric field only, and 100 MHz, 400 MHz, 1 GHz and 10 GHz plane wave fields and with leakage probing no closer then 2 in. (51 mm) from the shielding around door peripheries, accessible joints, filter and air duct penetrations.