Date: Sat, 22 Jul 2000 16:36:14 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Louis A. Mamakos" <louie@TransSys.COM> Cc: Brian Fundakowski Feldman <green@FreeBSD.ORG>, Kris Kennaway <kris@FreeBSD.ORG>, arch@FreeBSD.ORG Subject: Re: Quantifying entropy Message-ID: <406.964276574@critter.freebsd.dk> In-Reply-To: Your message of "Sat, 22 Jul 2000 10:32:24 EDT." <200007221432.KAA66024@whizzo.transsys.com>
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In message <200007221432.KAA66024@whizzo.transsys.com>, "Louis A. Mamakos" writ es: >I think we're overestimating the extent of the threat. Hell, an attacker >could fire a particle beam at phk's geiger counter and comprise it as well. Actually, he would just give me more random bits that way :-) The way to use a geiger is to time three events: e1 e2 e3 |-T1---|---T2--| if T1 > T2 bit == 0 else if T1 < T2 bit == 1 else try_again; And invert every other bit to remove any systematic bias. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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