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Date: Sat, 25 Dec 2010 14:43:49 -0800 From: Dan Kaminsky <dan@...para.com> To: BMF <badmotherfsckr@...il.com> Cc: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk> Subject: Re: how i stopped worrying and loved the backdoor Sent from my iPhone On Dec 25, 2010, at 2:38 PM, BMF <badmotherfsckr@...il.com> wrote: > On Sat, Dec 25, 2010 at 2:12 PM, <cpolish@...ewest.net> wrote: >> Check out Markus Jacobsson et al, "A Practical Secure Physical Random >> Bit Generator", 1998, using the turbulence of airflow inside the drive >> as the source of randomness. Can't do much better than that. > > I read that when it came out. I am quite familiar with turbulent > boundary layers. Nobody sells hardware (hard drives, in this case) > which actually implements the technique. All of my original queries > still stand. Making noisy diodes isn't all that hard, AFAIK. You eliminate bias by only returning difference bits -- 01 is a 0, 10 is a 0. Whether the underlying silicon is in fact doing that...well, that's a question for the chip reversers. > > BMF > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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