Re: [Full-disclosure] how i stopped worrying and loved the backdoor

[Dan Kaminsky <dan@xxxxxxxxxxx>]

Sent from my iPhone

On Dec 25, 2010, at 2:38 PM, BMF <badmotherfsckr@xxxxxxxxx> wrote:

> On Sat, Dec 25, 2010 at 2:12 PM,  <cpolish@xxxxxxxxxxxx> 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
> 
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