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From: Ian Lepore <freebsd@damnhippie.dyndns.org>
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Cc: Arthur Mesh <arthurmesh@gmail.com>, Barton <dougb@FreeBSD.ORG>,
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Subject: Re: svn commit: r239569 - head/etc/rc.d
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On Tue, 2012-09-11 at 13:09 -0700, David O'Brien wrote:
> 
> Good to see someone have thoughts on this.
> I've only seen it stated that entropy passes thru mostly "untouched"
> thru
> a cryptographic hash in the literature.  I haven't seen anything
> mentioned
> about entropy thru a compression algorithm other than as an estimation
> of entropy.

I would expect that a lossless compression scheme by definition could
not destroy entropy, it could only change the way it's encoded.

Whether the same might be true of a hash is an interesting question,
since it discards information rather than just changing the way it's
encoded.

-- Ian