Date: Thu, 03 Mar 2005 19:10:16 -0500 From: "Perry E. Metzger" <perry@piermont.com> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>, tls@rek.tjls.com Cc: cryptography@metzdowd.com Subject: Re: FUD about CGD and GBDE Message-ID: <87wtsogtjr.fsf@snark.piermont.com> In-Reply-To: <20050303215114.GA18604@panix.com> (Thor Lancelot Simon's message of "Thu, 3 Mar 2005 16:51:14 -0500") References: <Pine.NEB.4.62.0503031625170.12890@server.duh.org> <11487.1109886334@critter.freebsd.dk> <20050303215114.GA18604@panix.com>
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Thor Lancelot Simon <tls@rek.tjls.com> writes: > I think there's a misunderstanding here. Why do you think secrecy > (unpredictability?) is an important property of an IV for a block > cipher used in CBC mode? It's not an encryption key, it's an IV. Indeed. The IV can (subject to some constraints) be anything you like. Not having it public at very, very best denies one block from the ciphertext to the attacker -- ultimately not very useful in this application to prevent cracking given the low unicity distance. -- Perry E. Metzger perry@piermont.com
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