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From: Dan Kaminsky (dandoxpara.com)
Date: Sat Dec 25 2010 - 16:43:49 CST
Sent from my iPhone
On Dec 25, 2010, at 2:38 PM, BMF <badmotherfsckrgmail.com> wrote:
> On Sat, Dec 25, 2010 at 2:12 PM, <cpolishsurewest.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.
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