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1998-12-23 - Re: Question about ‘TEMPEST’: UPS

Header Data

From: Bill Stewart <bill.stewart@pobox.com>
To: cypherpunks@Algebra.COM
Message Hash: 436a8efc963c5dac5eb8a7028bdee49e9ca96f7cf70661b0cdcaf922c8251d8f
Message ID: <3.0.5.32.19981223120228.009bf320@idiom.com>
Reply To: <Pine.LNX.3.96.981223003628.24980B-100000@albert>
UTC Datetime: 1998-12-23 20:58:30 UTC
Raw Date: Thu, 24 Dec 1998 04:58:30 +0800

Raw message

From: Bill Stewart <bill.stewart@pobox.com>
Date: Thu, 24 Dec 1998 04:58:30 +0800
To: cypherpunks@Algebra.COM
Subject: Re: Question about 'TEMPEST': UPS
In-Reply-To: <Pine.LNX.3.96.981223003628.24980B-100000@albert>
Message-ID: <3.0.5.32.19981223120228.009bf320@idiom.com>
MIME-Version: 1.0
Content-Type: text/plain



At 09:39 AM 12/23/98 -0600, Igor Chudov @ home wrote:
>Just curious, if a computer is connected to the electric power through a UPS,
>does that reduce emissions leaked into the electrical system?:wq

It should probably reduce them a bit, depending on your UPS design,
but if you have to worry about people monitoring your electricity
for contraband bits, you've got a whole raft of other things
you'd better start taking care of, like disk encryption and
offsite backups and signs on the door indicating that you
will or will not shoot at police if they do or do not have warrants....

The converse is that if you've got an electrical filtering system
as part of your TEMPEST protection, whether it's in your computer's
power supply or separate or both, you tend to have really nice
clean power feeding your computer, which is a Good Thing.

				Thanks! 
					Bill
Bill Stewart, bill.stewart@pobox.com
PGP Fingerprint D454 E202 CBC8 40BF  3C85 B884 0ABE 4639

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