[Cryptography] 'The intelligence coup of the century'

[John Young]

At 05:17 PM 2/15/2020, you wrote:

>Anyway, the servers were supposed to be located in a shielded room 
>(I don't know whether it was supposed to be TEMPEST-rated) and one 
>of the officer's pagers went off.  He was flabbergasted, and posited 
>that if that stuff could get in, then what was getting out?
>
>-- Dave

There are degrees of compromising emanations protection, not a single 
measure. Portable units of various sizes are at the ower end, the 
higher end are constructed extensively according to the desired level 
of protection.

There are also various emanations in the electromagnetic spectrum to 
be protected, radio, acoustic, visible, vibration, various wave 
lengths, signal strengths, nearby inadvertent and advertent 
amplifiers and reflectors, and others not easily identified without clearance.

An infamous instance is the US Army prolonged search for a 
distinctively shaped object which reflected protected signals 
passively, no power needed. Seemed innocent so not examined closely 
until happenstance and wits end focused on it.

Quite a few examples of discovery of unsuspected breaches, 
electronic, machinic and the oldest of all, human. Server farms of 
clouds, say. Wits end is a continuing problem.