NAME

xsend, xget, enroll − secret mail

SYNOPSIS

xsend person
xget
enroll

DESCRIPTION

These commands implement a secure communication channel similar to the mail(1) program.  Unlike the mail program, however, this channel ensures that no one can read the messages except the intended recipient.  To do this, these commands employ a public-key cryptosystem using knapsacks. 

Use the enroll command to set up the password check that lets you receive mail.  Enroll asks you for a password that you must enter at the xget prompt in order to receive secret mail. 

To receive secret mail, type xget.  It asks for your password, 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. 

FILES

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

SEE ALSO

mail(1)

BUGS

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

INTEGRATED SOLUTIONS 4.3 BSD  —  April 29, 1985