I've seen semantics of the KC/KI encryption system used on smart cards for the local PCN cellular system. Does anybody know whether this is secure, and where to get more info on it? The smart card seems to generate keys by itself that are used by the cellular phone to encrypt its calls. Could this be applied as a universal smart card crypto system? ------------------------------------------------------------------------------- Patiwat Panurach Whatever you can do, or dream you can, begin it. eMAIL: pati@ipied.tu.ac.th Boldness has genius, power and magic in it. m/18 junior Fac of Economics -Johann W.Von Goethe -------------------------------------------------------------------------------