On Mon, 5 Feb 2007, Oded Arbel wrote:

You seem to imply that with off-the-record, both a third party that has
access to the entire session can prove the identity of at least one side
of it (destroying deniability) and that on a second session one cannot
be assured of the identity of the other person w/o again performing
manual verification (destroying authentication).
So you are essentially calling the OTR guys liars, right ?

I am not familiar with OTR but I have good reasons to believe that if a third party (like an OTR client's ISP) intercepts all the client's communications with otr during a session then they may be able to play man-in-the-middle after that. Unless the otr client and otr (or another client) share a secret that is not communicated through the intercepted channels. So I'm not calling them liars, please don't put words in my mouth, I hate that. I assume that with sufficient effort the powers that be could eavesdrop on the communication without trying very hard.

Peter

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