[21587] in cryptography@c2.net mail archive
Re: Entropy Definition (was Re: passphrases with more than 160 bits
daemon@ATHENA.MIT.EDU (John Denker)
Fri Mar 24 18:39:45 2006
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Fri, 24 Mar 2006 16:45:37 -0500
From: John Denker <jsd@av8n.com>
To: Ed Gerck <edgerck@nma.com>, cryptography@metzdowd.com
In-Reply-To: <44243656.3080105@nma.com>
Ed Gerck wrote:
> In Physics, Thermodynamics, entropy is a potential [1].
That's true in classical (19th-century) thermodynamics, but not
true in modern physics, including statistical mechanics. The
existence of superconductors and superfluids removes all doubt
about the absolute zero of entropy. For details, see
http://www.av8n.com/physics/thermo-laws.htm#sec-spectator
http://www.av8n.com/physics/thermo-laws.htm#sec-secret-s
> As is usual for a potential, only *differences* in entropy
> between different states can be measured.
Not true.
....
> These are quite general properties.
They are neither general nor relevant to crypto.
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