Series of minor questions about OpenPGP 5
avi.wiki at gmail.com
Wed Jan 28 21:34:40 CET 2009
> ---------- Forwarded message ----------
> From: Ingo Klöcker <kloecker at kde.org>
> To: gnupg-users at gnupg.org
> Date: Wed, 28 Jan 2009 21:09:38 +0100
> Subject: Re: Series of minor questions about OpenPGP 5
> On Wednesday 28 January 2009, Robert J. Hansen wrote:
> > Peter Thomas wrote:
> > > I've read about special hardware devices that (claim to) give true
> > > random numbers, some based on thermodynamics some even on quantum
> > > mechanics.
> > True randomness exists in nature, but so far we're unable to detect
> > it. (Seriously.)
> > Imagine you have a Geiger counter and a radioactive sample. Over
> > each time frame, the Geiger counter reports how many decays it
> > measures. That number becomes your random value. So far, so random,
> > right?
> > But a Geiger counter has a reset time. Once it clicks, there's a
> > small time window in which it's unable to detect new decay events.
> > This has the effect of introducing a bias into your random number
> > generator: some decay events will be transformed into non-events.
> > There are some tricks of physics and mathematics you can use to get
> > very high quality values out of this kind of radioisotope setup, but
> > the basic problem remains: even when measuring a totally
> > nondeterministic event, determinism in the detection mechanism will
> > undercut you. You can get really, really close to truly random
> > numbers, but you can't get there.
> See http://www.fourmilab.ch/hotbits/ for a random number generator using
> radioactive decay.
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That still suffers from Robert's point about the deterministic
effect of resetting the detector.
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Version: GnuPG v1.4.9 (MingW32) - GPGshell v3.71
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pub 1024D/785EA229 3/6/2007 Avi (Wikipedia-related) <aviwiki at gmail.com>
Primary key fingerprint: D233 20E7 0697 C3BC 4445 7D45 CBA0 3F46 785E
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