Re: [PATCH] (0/4) Entropy accounting fixes

From: Marco Colombo (
Date: Mon Aug 19 2002 - 07:56:10 EST

On 19 Aug 2002, Alan Cox wrote:

> On Mon, 2002-08-19 at 11:47, Marco Colombo wrote:
> >
> > BTW, I know you wrote the amd768-rng driver, I wonder if you have any
> > indication of how good these rng are. What is the typical output bits/
> > random bits ratio in normal applications?
> It seems random. People have subjected both the intel and AMD one to
> statistical test sets. I'm not a cryptographer or a statistician so I
> can't answer usefully

Oh, ok. I've asked only because some time ago I wrote a small tool set
to get random bits from /dev/audio and feed them to /dev/random
(ala audio-entropyd, but it does FIPS 140-2). You can configure how
many bits to account via RNDADDTOENTCNT every N bits you write to
/dev/random (I use 1/80). Since in principle it can take random data
from any source, I'd wondered if someone had an esteem of the parameter
for HRNGs. Thanks anyway.


      ____/  ____/   /
     /      /       /			Marco Colombo
    ___/  ___  /   /		      Technical Manager
   /          /   /			 ESI s.r.l.
 _____/ _____/  _/

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