Also, as Steve Crocker points out, use of any sort of message
ID, covered by the PEM protection, will suffice to detect replays. The
use of sequence numbers also allows a recipient to detect deletions
as well.
Why not simply a date. It won't prevent deletions, but replays
become irrelevant.
--
Philippe Hebrais hebrais(_at_)mirkwood(_dot_)cam(_dot_)org
Voix: (514)731-9146 uunet!philmtl!altitude!mirkwood!hebrais
It is against the grain of modern education to teach children to
program. What fun is there in making plans, acquiring discipline in
organizing thoughts, devoting attention to detail, and learning to be
self-critical?
-- Alan Perlis