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Re: Time Expiry Alogorithm??
From: Andrew Farmer <andfarm () teknovis com>
Date: Tue, 23 Nov 2004 20:27:47 -0800
On 23 Nov 2004, at 15:02, Florian Weimer wrote:
* Andrew Farmer:
Especially considering that there aren't enough atoms in the universe
store all that precalculated data, nor enough energy to do all the
Typically, such estimates ignore the possibilities of quantum
On the other hand, we have yet to create a practical quantum computer.
(Schneier says that there's enough energy in a supernova to do about
2^224 operations on a 100% efficient computer. And remember that AES
or PGP take multiple operations to calculate results...)
Schneier's estimates are wrong. They are based on the incorrect
assumption that all bit operations are irreversible and
entropy-increasing. There is no hard evidence that this is true in
On the other hand, we have yet to discover a way to circumvent the
law of thermodynamics.
If quantum computing comes through (and I doubt it will), we'll all
using quantum encryption. Until then, 256 bits is good enough for me.
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Re: Time Expiry Alogorithm?? Valdis . Kletnieks (Nov 19)
Re: Time Expiry Alogorithm?? Gary E. Miller (Nov 20)