linux-kernel - Re: Why does reading from /dev/urandom deplete entropy so much?

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Message-ID: <20071204180237.GU19691@waste.org>
Date:	Tue, 4 Dec 2007 12:02:37 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ray Lee <ray@...rabbit.org>, Adrian Bunk <bunk@...nel.org>,
	Marc Haber <mh+linux-kernel@...schlus.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Why does reading from /dev/urandom deplete entropy so much?

On Tue, Dec 04, 2007 at 04:55:02PM +0000, Alan Cox wrote:
> > cryptographically strong stream it'll provide when /dev/random is
> > tapped? In principle, this'd leave more entropy available for
> > applications that really need it, especially on platforms that don't
> > generate a lot of entropy in the first place (servers).
> 
> 
> As reported about a month ago, the evidence is that the /dev/random
> stream is not cryptographically strong. Collecting uuids generated from
> the kernel uuid random generator from the random generator in the kernel
> shows abnormal patterns of duplicates.

Pointer, please.

-- 
Mathematics is the supreme nostalgia of our time.
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