Full Disclosure mailing list archives
Re: Skype chat encryption with OTR
From: Tonnerre Lombard <tonnerre.lombard () sygroup ch>
Date: Fri, 20 Jun 2008 08:46:33 +0200
Salut, JM, On Thu, 19 Jun 2008 08:55:01 -0500, JM wrote:
Actually, the shared keys are *published* once they're discarded to improve plausible deniability. That lets anyone forge an *old* message, but ensures you wont' accept a forged message during the course of the conversation.
Oh, hm, right. But either way, the plausible deniability is provided only by that mechanism, not through changing the keys after each message. That's only the mechanism used to recover the security of the algorithm after key disclosure. It's the typical cryptographic type of proof if authenticity which is executed in a way which is only ever trustworthy to the recipient, so the recipient cannot prove anything to others with it. Tonnerre -- SyGroup GmbH Tonnerre Lombard Solutions Systematiques Tel:+41 61 333 80 33 Güterstrasse 86 Fax:+41 61 383 14 67 4053 Basel Web:www.sygroup.ch tonnerre.lombard () sygroup ch
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