Entropy Definition (was Re: passphrases with more than 160 bits of entropy)

[John Denker]

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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