From: butzerd@maumee.eng.ohio-state.edu (Dane C. Butzer)
Subject: Re: Once tapped, your code is no good any more.
Organization: The Ohio State University Dept of Electrical Engineering
Distribution: na
Lines: 19

In article <1993Apr20.034724.3748@colnet.cmhnet.org> res@colnet.cmhnet.org (Rob Stampfli) writes:
>>>	With E-Mail, if they can't break your PGP encryption, they'll just
>>>call up one of their TEMPEST trucks and read the electromagnetic emmisions
>>>from your computer or terminal.  Note that measures to protect yourself from
>>
>>2. I could independently invent about half a dozen right off
>>the top of my head. If I had studied Advanced E & M a little better,
>>I could probably come up with a _very_ good system.
>
>Wouldn't a a second monitor of similar type scrolling gibberish and adjacent
>to the one being used provide reasonable resistance to tempest attacks?

Actually, old video games and pinball machines are supposed to work pretty
good (at blocking EM eavesdropping), too.  Those things put out a LOT of EM
noise.  Back in the 80's, I read about computer companies putting bunches
of games in their buildings for just this purpose (not to mention the $$$).


Dane
