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Date: Sat, 08 Dec 2007 13:31:09 -0500
From: Jeff Garzik <jeff@garzik.org>
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To: Theodore Tso <tytso@mit.edu>, Mike McGrath <mmcgrath@redhat.com>,
       Jon Masters <jonathan@jonmasters.org>, Matt Mackall <mpm@selenic.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Ray Lee <ray@madrabbit.org>,
       Adrian Bunk <bunk@kernel.org>,
       Marc Haber <mh+linux-kernel@zugschlus.de>, linux-kernel@vger.kernel.org
Subject: Re: Why does reading from /dev/urandom deplete entropy so much?
References: <20071204210827.GE19691@waste.org> <4755C423.60907@redhat.com> <20071204221525.GG19691@waste.org> <4755D350.1080801@redhat.com> <20071204223345.GJ19691@waste.org> <4756B50B.3060100@redhat.com> <20071205144934.GL7259@thunk.org> <1197099477.20786.149.camel@perihelion> <20071208173204.GI17037@thunk.org> <475AD585.7020908@redhat.com> <20071208174908.GJ17037@thunk.org>
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Theodore Tso wrote:
> On Sat, Dec 08, 2007 at 11:33:57AM -0600, Mike McGrath wrote:
>>> Huh?  What's the concern?  All you are submitting is a list of
>>> hardware devices in your system.  That's hardly anything sensitive....
>> We actually had a very vocal minority about all of that which ended up 
>> putting us in the unfortunate position of generating a random UUID instead 
>> of using a hardware UUID from hal :-/
> 
> Tinfoil hat responses indeed!  Ok, if those folks are really that
> crazy, my suggestion then would be to do a "ifconfig -a > /dev/random"

heh, along those lines you could also do

	dmesg > /dev/random

<grin>

dmesg often has machine-unique identifiers of all sorts (including the 
MAC address, if you have an ethernet driver loaded)

	Jeff