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XSEND(1)                    General Commands Manual                   XSEND(1)



NAME
       xsend, xget, enroll - send or receive secret mail

SYNOPSIS
       xsend username

       xget

       enroll

DESCRIPTION
       These  commands implement a secure communication channel, which is like
       mail(1), but no one can read the messages except the  intended  recipi-
       ent.  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  password,  then
       gives you the messages.

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

FILES
       /var/spool/secretmail/*.key
                                keys
       /var/spool/secretmail/*.[0-9]
                                messages

SEE ALSO
       mail(1)

BUGS
       The knapsack public-key cryptosystem is known to be breakable.

       Secret mail should be integrated with ordinary mail.

       The announcement of secret mail makes "traffic analysis" possible.



                               9 September 1987                       XSEND(1)