NODE a6883491TEMPEST
jjaloszyns@bluejay.mich.fred.orgFri, 23 Oct 92 10:04:47 PDT
There has been quite a bit of concern about certain people (agencies)
using a TEMPEST machine and invading privacy. Most of the things to
defeat this that have been taked about have revolved around shielding.
What would be the problem with having another device to emit random
signals on the same frequency that your monitor operates on? Has this
already been implimented? Legal?
jon
<jjaloszyns@bluejay.mich.fred.org> ------------- 43.31.28N, 84.41.41W
Jon Jaloszynski
Student 9-12 at Shepherd HS, Shepherd Shepherd, MI
NODE c653ebefTEMPEST
Eric Hughes <hughes@soda.berkeley.edu>Fri, 23 Oct 92 10:33:40 PDT
It should be possible to jam your own emissions, but that same noise
might cause be picked up by your own equipment as well and cause
errors. Also remember that most of these signals are detected by
correlation, which detects a signal even with a very high S/N ratio.
So it's not obvious just how to jam. My first guess is to phase-lock
onto your own emmissions and then broadcast random bits at higher
strength.
With E/M monitoring, just like cryptography, you don't really know how
to make defenses unless you know how to attack.
Eric