If you need to send a command to a remote node over an unsecure network
(for example HAM radio), or a network you don't really want to bother
securing, one way to "authenticate" yourself is by GPG-signing your message=
..

Q: If I send a remote node my GPG-signed message, how would I prevent
someone else capturing that signed message and replicating it over and over
again? One way is to include a counter or something unique in the message
that can only be used once, but is there another way?
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.