[45183] in Cypherpunks
Re: Timing Cryptanalysis Attack
daemon@ATHENA.MIT.EDU (Matt Blaze)
Mon Dec 11 16:13:51 1995
To: perry@piermont.com
Cc: cypherpunks@toad.com
In-Reply-To: Your message of "Mon, 11 Dec 1995 13:15:50 EST."
<199512111815.NAA02202@jekyll.piermont.com>
Date: Mon, 11 Dec 1995 14:06:55 -0500
From: Matt Blaze <mab@crypto.com>
>The trivial way to handle this is simply to check user time with the
>right system calls and make sure it always comes out the same with an
>apropriate number of sleeps.
Of course, this works against a remote adversary, but not against one
on the same machine who can look at actual CPU consumption (which doesn't
increase when the target is blocked).
-matt
