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

From: Oliver Neukum (
Date: Mon Aug 19 2002 - 05:25:22 EST

Am Montag, 19. August 2002 12:15 schrieb Marco Colombo:
> On Mon, 19 Aug 2002, Theodore Ts'o wrote:
> [...]
> > P.S. /dev/urandom should probably also be changed to use an entirely
> > separate pool, which then periodically pulls a small amount of entropy
> > from the priamry pool as necessary. That would make /dev/urandom
> > slightly more dependent on the strength of SHA, while causing it to
> > not draw down as heavily on the entropy stored in /dev/random, which
> > would be a good thing.
> Shouldn't it be moved to userpace, instead? Pulling a small amount
> of entropy from /dev/random can be done in userspace, too. And the

1. You create a problem for in kernel users of random numbers.
2. You forgo the benefit of randomness by concurrent access to /dev/urandom
3. You will not benefit from hardware random number generators as easily.

> application could choose *how often* and *how many* bits to pull.

If you really care, you can implement this for /dev/urandom, too.


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