Date: Thu, 18 Sep 1997 23:47:59 -0700 From: "Jordan K. Hubbard" <jkh@time.cdrom.com> To: "Jamil J. Weatherbee" <jamil@counterintelligence.ml.org> Cc: Eivind Eklund <perhaps@yes.no>, md6tommy@mdstud.chalmers.se, freebsd-hackers@FreeBSD.ORG Subject: Re: CDROM image Message-ID: <21980.874651679@time.cdrom.com> In-Reply-To: Your message of "Thu, 18 Sep 1997 21:16:37 PDT." <Pine.BSF.3.96.970918211545.1097B-100000@counterintelligence.ml.org>
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The CDROM comes with automatic entropy reduction features, don't worry. For one thing, we take the output of a very high quality random number generator (a ring of 40 sampled lava lamps from SGI's Countercultural Randomness division), bias it with the detected events from a cosmic ray detector and then write this in a subtrack on the CD. When data from the CD is read, the randomness is automatically inverted and added to the data, thus cancelling out any entropy in a fashion similar to the way noise cancellation is carried out. In other words, don't sweat it. We're experts, dude. Jordan > > So how does this effect the entropy of the system of bits? > > > trees, etc. If you look at the sheer volume of bits involved, they're > > really almost completely different products. > > > Jordan > > >
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