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

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Message-ID: <20071204165502.0a8f695e@the-village.bc.nu>
Date:	Tue, 4 Dec 2007 16:55:02 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Ray Lee" <ray@...rabbit.org>
Cc:	"Adrian Bunk" <bunk@...nel.org>, "Matt Mackall" <mpm@...enic.com>,
	"Marc Haber" <mh+linux-kernel@...schlus.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Why does reading from /dev/urandom deplete entropy so much?

> 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.

Alan
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