[149142] in cryptography@c2.net mail archive
Re: [Cryptography] cheap sources of entropy
daemon@ATHENA.MIT.EDU (John Denker)
Mon Jan 20 14:20:05 2014
X-Original-To: cryptography@metzdowd.com
Date: Mon, 20 Jan 2014 11:59:47 -0700
From: John Denker <jsd@av8n.com>
To: cryptography@metzdowd.com
In-Reply-To: <DDF854E2-BB5C-4BC0-8992-932B03006D35@lrw.com>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com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