using SRAM state as a source of randomness
Ivan Krstić
krstic at solarsail.hcs.harvard.edu
Sun Sep 16 12:35:20 EDT 2007
On Sep 12, 2007, at 7:06 AM, Udhay Shankar N wrote:
> Sounds like an interesting idea - using SRAM state as a source of
> randomness. Any of the folks here willing to comment on this?
If you care about your randomness, you don't want to be making the
assumption that a source is random because "it sometimes looks that
way, sort of". You want to be using a source that's assumed random
because, as far as you know, it's very hard for it to be any other way.
Clearly, SRAM state falls into the former category, and there are
lots and lots of variables keeping it firmly outside the latter. This
means the usual wisdom applies: if you really need the extra entropy,
mix some of these SRAM state bits into your pool, but make sure
you're also feeding the pool from at least one source about whose
randomness you can reason strongly.
--
Ivan Krstić <krstic at solarsail.hcs.harvard.edu> | http://radian.org
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