Full Disclosure mailing list archives
Re: how i stopped worrying and loved the backdoor
From: coderman <coderman () gmail com>
Date: Sat, 25 Dec 2010 22:45:22 -0800
On Sat, Dec 25, 2010 at 2:43 PM, Dan Kaminsky <dan () doxpara com> wrote:
... 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.
noisy diodes, free spinning oscillators, ring oscillators, sub samplings of above in complex structures, lots of options without lava lamp or spinning platter craziness. [0] as for eliminating bias, the von Neumann whitener as you describe works well, but has unpredictable throughput. (that is, one word/buffer may take longer to fill than the next depending on generated bits, and at best you've got a significant reduction in throughput.) this is one reason it is preferable to read raw biased entropy at maximum rate from the hardware source into an entropy daemon which then validates hardware output before whitening, compressing, and/or digesting read bits. best regards, happy holidays, done beating this dead horse for now... ;) 0. there's a nice survey/list in chapter 4 of Cryptographic Engineering. http://books.google.com/books?isbn=0387718168 _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- Re: how i stopped worrying and loved the backdoor, (continued)
- Re: how i stopped worrying and loved the backdoor Marsh Ray (Dec 24)
- Re: how i stopped worrying and loved the backdoor coderman (Dec 24)
- Re: how i stopped worrying and loved the backdoor BMF (Dec 24)
- Re: how i stopped worrying and loved the backdoor Dan Kaminsky (Dec 24)
- Re: how i stopped worrying and loved the backdoor Marsh Ray (Dec 24)
- Re: how i stopped worrying and loved the backdoor Marcio B. Jr. (Dec 24)
- Re: how i stopped worrying and loved the backdoor BMF (Dec 24)
- Re: how i stopped worrying and loved the backdoor cpolish (Dec 25)
- Re: how i stopped worrying and loved the backdoor BMF (Dec 25)
- Re: how i stopped worrying and loved the backdoor Dan Kaminsky (Dec 25)
- Re: how i stopped worrying and loved the backdoor coderman (Dec 25)
- Re: how i stopped worrying and loved the backdoor coderman (Dec 25)
- Re: how i stopped worrying and loved the backdoor coderman (Dec 25)
- Re: how i stopped worrying and loved the backdoor coderman (Dec 25)
- backtrack-linux.org hacked? Darren Thurston (Dec 27)
- Re: backtrack-linux.org hacked? Григорий Братислава (Dec 27)
- Re: backtrack-linux.org hacked? coderman (Dec 27)
- Re: backtrack-linux.org hacked? Dave Nett (Dec 27)
- Re: backtrack-linux.org hacked? Christian Sciberras (Dec 27)
- Re: backtrack-linux.org hacked? coderman (Dec 27)
- Re: how i stopped worrying and loved the backdoor Marsh Ray (Dec 26)