pgp and viacrypt will always generate differnt outputs: pgp adds some pseudo-random stuff to the start of the file it is encrypting to ensure that a file encrypts differently each time. This means that I am trusting the "pseudo-random" stuff not to be some secrets that PGP has read from my disk. The only benefit

peter honeyman <honey@citi.umich.edu> says: that I see to the pseudo-random stuff is to send the same message to several people without revealing the fact that the messages are the same except to those that can decode the messages.