(TEMPEST )
countermeasures against electromagnetic compatibility (EMC) problems
Since EMC countermeasures may reduce emissions but often fail to completely eliminate emissions, there is a different approach to reduce vulnerability of the security.
If you are talking about side channel attacks
http://gauss.ececs.uc.edu/Courses/c653/lectures/PDF/side-channel.pdf
the most effective counter measure would be to add circuitry to your system adding EM emission which hides the emission of the content which should be portected.
The best counter measure would be to create emission by a mirrored hardware which is doing the opposite compared to your initial hardware. As an example, this means that if your system is doing an addition or multiplication depending on the data input the counter system should do the exact opposite. So when the original sytem is doing addition the counter system is doing an multiplication and if the original system is doing a multiplication your counter system should do an addition. If both system have the same emission characteristics, form outside, based on the electromagnetic radiation it is very hard to distinguish which system is doing a certain operation as the radiated fields add up.
thank you very much for your attention i hope to complete phd in computer security in russia and i need to collect information for this branch
Dear Sir,
one way is to use a good metal shielding layer for rooms and cables.
All the best
F. Gräbner
Faraday cages are always very popular! See also: https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200810sf2.pdf&mode=show_pdf
i used jamming technique with shielding in my M.Sc thesis ((Improvement of Jamming Generators Efficiency for Information Protection against Leakage via Electromagnetic Channels))
but i need more information for TEMPEST
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