linux-kernel - Re: [RFC PATCH 0/5] CPU Jitter RNG

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Date:	Mon, 10 Feb 2014 16:07:44 -0500
From:	Jörn Engel <joern@...fs.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Theodore Ts'o <tytso@....edu>,
	Stephan Mueller <smueller@...onox.de>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>, dave.taht@...il.com,
	John Crispin <blogic@...nwrt.org>, andrewmcgr@...il.com,
	Thorsten Glaser <tg@...bsd.de>, sandyinchina@...il.com
Subject: Re: [RFC PATCH 0/5] CPU Jitter RNG

On Tue, 4 February 2014 12:39:28 -0800, H. Peter Anvin wrote:
> 
> USB and the Ethernet PHY frequently do still have their own crystals,
> for reasons not entirely clear to me.  However, what all of these have
> in common is that they are way out in the periphery.

Storage might be another source.  We have had add_disk_randomness()
forever.  Flash also takes quite variable timings for writes and
erases.  Even if the timings are not random, they certainly change
from block to block and depending on wear.

I am less certain about reads.  But one can run a few experiments and
see how consistent the timings are.

Jörn

--
Linux is more the core point of a concept that surrounds "open source"
which, in turn, is based on a false concept. This concept is that
people actually want to look at source code.
-- Rob Enderle
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