septillion operations per second

Ian Goldberg iang at abraham.cs.berkeley.edu
Thu Jun 21 10:58:08 EDT 2001


In article <200106202050.f5KKoqE10754 at valis.black-ice.org>,
Mike Brodhead  <mkb at black-ice.org> wrote:
>take a peek at the chapter on key lengths in Schneier's Applied
>Cryptography.  it is an entertaining read.  in short, he makes the
>case that computers as we understand them simply cannot conduct brute
>force attacks against 128-bit or larger semetric keys.  (i won't
>repeat his explanation here.)

Actually, his explanation (which involves the energy required to erase
bits) isn't correct; look up "reversible computing", which is a way
to do computations at lower energy than the limit he proposes.

   - Ian



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