32v 1m xsend
XSEND, XGET, ENROLL(1)UNIX Programmer's ManualXSEND, XGET, ENROLL(1)
xsend, xget, enroll - secret mail
xsend person xget enroll
These commands implement a secure communication channel; it is like mail(1), but no one can read the messages except the intended recipient. The method embodies a public-key cryptosystem using knapsacks.
To receive messages, use enroll; it asks you for a password that you must subsequently quote in order to receive secret mail.
To receive secret mail, use xget. It asks for your pass- word, then gives you the messages.
To send secret mail, use xsend in the same manner as the ordinary mail command. (However, it will accept only one target). A message announcing the receipt of secret mail is also sent by ordinary mail.
/usr/spool/secretmail/*.key: keys /usr/spool/secretmail/*.[0-9]: messages
It should be integrated with ordinary mail. The announcement of secret mail makes traffic analysis possible.