[147888] in cryptography@c2.net mail archive
Re: [Cryptography] My comments regarding using CPU jitter for
daemon@ATHENA.MIT.EDU (Bill Frantz)
Wed Oct 30 00:02:32 2013
X-Original-To: cryptography@metzdowd.com
Date: Tue, 29 Oct 2013 20:47:02 -0700
From: Bill Frantz <frantz@pwpconsult.com>
To: cryptography@metzdowd.com
In-Reply-To: <20131028230343.GA31699@thunk.org>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
On 10/28/13 at 4:03 PM, tytso@mit.edu wrote:
>Maybe someone can prove that there is more entropy because of some
>instability between the oscillator used by the CPU clock and the one
>used by the ethernet NIC, and so I'm being hopelessly
>over-conservative. Perhaps; but until we know for sure, using a
>similar analysis to what I described above, I'd much rather be slow
>than be potentially insecure.
And in 5 years time, someone will build hardware that uses the
same oscillator for both the CPU clock and the Ethernet NIC,
doing to clock jitter entropy what solid state disks did to Don
Davis' "Cryptographic randomness from air turbulence in disk
drives" approach.
Cheers - Bill
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