 

You would have to use something other than the AT&T black box - in other
words, I don't think public key would work.  The session key would have 
to be agreed upon prior to the conversation and distributed to all 
sites beforehand.

Or go out and get a STU-III ;-)

-- 
Doug Bank                       Private Systems Division
dougb@ecs.comm.mot.com          Motorola Communications Sector
dougb@nwu.edu                   Schaumburg, Illinois
dougb@casbah.acns.nwu.edu       708-576-8207                    