Date: Tue, 11 Sep 2012 15:01:25 -0600 From: Ian Lepore <freebsd@damnhippie.dyndns.org> To: obrien@FreeBSD.ORG Cc: Arthur Mesh <arthurmesh@gmail.com>, Barton <dougb@FreeBSD.ORG>, freebsd-rc@FreeBSD.ORG, RW <rwmaillists@googlemail.com>, Doug, Dag-Erling Sm?rgrav <des@des.no> Subject: Re: svn commit: r239569 - head/etc/rc.d Message-ID: <1347397285.1110.15.camel@revolution.hippie.lan> In-Reply-To: <20120911200925.GA88456@dragon.NUXI.org> References: <50453686.9090100@FreeBSD.org> <20120904220754.GA3643@server.rulingia.com> <20120906174247.GB13179@dragon.NUXI.org> <20120906230157.5307a21f@gumby.homeunix.com> <20120906224703.GD89120@x96.org> <50493480.8060307@FreeBSD.org> <20120911061530.GA77399@dragon.NUXI.org> <504EDC67.9070700@FreeBSD.org> <86sjao7q8c.fsf@ds4.des.no> <20120911205302.27484fd6@gumby.homeunix.com> <20120911200925.GA88456@dragon.NUXI.org>
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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
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