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On 20/02/13 02:49, Jonathan Warren wrote:
> Suppose when Alice firsts sends a message to Bob she also includes
> a short term public key. Bob takes the short term public key and
> encrypts symmetric_key_1 ("SK1") and also encrypts a message with
> SK1 and sends the encrypted SK1 and the encrypted message to Alice.
> Alice decrypts the encrypted SK1 with her short term private key
> and then uses SK1 to decrypt the message. The short term public key
> pair can now be deleted. When Alice replies, she sends the message
> and a new SK2, encrypted with SK1, to Bob. Bob will decrypt with
> SK1 and store SK2. When he sends a message, he encrypts his message
> along with a new key, SK3, with SK2. This continues with a new
> symmetric key each time. Both parties must remember the last SK
> that they suggested to the other party, and also the last SK that
> they received from the other party. All others can be deleted.
Sorry, after re-reading what you wrote I've realised it's not as close
to OTR as I thought. Apologies for the noise.
Cheers,
Michael
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