Date: Wed, 19 Jul 2000 11:46:01 -0600 From: Warner Losh <imp@village.org> To: Peter Dufault <dufault@hda.com> Cc: current@FreeBSD.ORG Subject: Re: randomdev entropy gathering is really weak Message-ID: <200007191746.LAA82887@harmony.village.org> In-Reply-To: Your message of "Wed, 19 Jul 2000 09:08:36 EDT." <200007191308.JAA98111@hda.hda.com> References: <200007191308.JAA98111@hda.hda.com>
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In message <200007191308.JAA98111@hda.hda.com> Peter Dufault writes: : > The reason why ntp is interesting is that we compare the received data : > with our unpredictable local clock. It is the result of this comparison : > which is good entropy bits. : : Is the resolution of thermal sensors on many new motherboards and : CPU high enough to get thermal randomness? Yes. You'll also find that the voltage drifts as well. However, I doubt you'd be able to get more than 1 bit out of the voltage readings. The thermal readings, depending on their precision, would also yield several random bits. But this several may be only 3 or 4. The temperature varies based on work load and on the climate controls in place at the site. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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