On Tue, Sep 17, 2013 at 2:01 PM, Michael Rogers <mich...@briarproject.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi Marco, > > This is a problem we're working on as part of the Briar project. Our > approach is pretty simple: establish a shared secret when you first > communicate, periodically run that secret through a one-way function > to get a new shared secret, and destroy the old one.
Why not have separate symmetric keys for each direction of communication (Alice -> Bob, Bob->Alice). Then whenever a party encrypts or decrypts a message, they can update the corresponding key right away, instead of having to wait. (Or look at OTR's use of updating Diffie-Hellmans). Trevor _______________________________________________ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
