NAME

xsend, xget, enroll − send secure mail

SYNOPSIS

xsend user
xget
enroll

DESCRIPTION

These commands implement a secure communication channel.  It is similar to mail(1), except that no one can read the messages besides the intended recipient.  The method embodies a public-key cryptosystem using knapsacks. 

To enroll in the secure mail system, use enroll.  It requests a password which must subsequently be quoted in order to receive secret mail. 

To receive secret mail, use xget.  It requests the password, then displays the messages. 

To send secret mail, use xsend in the same manner as the ordinary mail command.  Xsend, however, will accept only one target.  A message announcing the receipt of secret mail is also sent by ordinary mail. 

FILES

/usr/spool/secretmail/∗.key: keys
/usr/spool/secretmail/∗.[0-9]: messages

SEE ALSO

mail(1)

BUGS

Secure mail should be integrated with ordinary mail.  The announcement of secret mail makes traffic analysis possible. 

INTEGRATED SOLUTIONS 4.2 BSD  —  1 August 1985