Synopsis:
   set encrypt_program [<program>]

Description:
   This features allows the user to specify an alternate means of
   encrypting (and decrypting) messages when ENCRYPT is used.  Both the
   sender and the recipient must use the same program for this to work
   properly.  In order to function with the client, the program must
   take the encryption key as the first command-line argument.

See Also:
   encrypt(5)