[Cryptography] Another possible source of randomness
mitch at niftyegg.com
Sat Mar 8 03:55:04 EST 2014
On Fri, Mar 7, 2014 at 7:13 PM, Dave Horsfall <dave at horsfall.org> wrote:
> Sitting here on my lounge, half-dressed (it's really hot in Oz right now),
> I was pondering another source of entropy.
> A ceiling fan, with vertical drapes, looking out onto a fairly busy road.
> Digitised, it ought to be good enough to seed a PRNG :-)
Any personal image set could be used as a personal seed for a PRNG.
Just make sure the camera is pointed outside on hot days. ;-)
Then there is the random walk down the road after a couple pints
used as random bubble filters for additional chaotic input.
The use of image set input does have the advantage that when
saved reproducible results come out of the PRNG. When local
images are captured, used, discarded (see Lavarand) the PRNG
is effectively impossible to guess.
Shared "family" images might be used in a one time pad style
stream protocol where the shared secret is knowing what
image set to use to initialize the PRNG stream.
Stay cool.... and hydrated.
T o m M i t c h e l l
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