Followup to: <Pine.LNX.email@example.com>
By author: Igmar Palsenberg <firstname.lastname@example.org>
In newsgroup: linux.dev.kernel
> > What if you simply tuned a cheap FM receiver to just static and fed
> > that into a soundcard. Then reading from /dev/dsp or something would
> > return pretty good random data, right ?
> Nope... Unless the receiver recieves a resonable amount of random
> interference, the data isn't considered random enough.
Thermal noise is probably your most easily available source of
randomness. The hard part is estimating the amount of entropy
derivable, unfortunately; electrical interference can cause the
entropy to be less than what you would expect. The /dev/random mixing
function takes care of removing the predictable stuff, but you still
need to get a value (conservative is fine) for the amount of entropy
-- <email@example.com> at work, <firstname.lastname@example.org> in private! "Unix gives you enough rope to shoot yourself in the foot."
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to email@example.com Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed May 31 2000 - 21:00:15 EST