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Unix Version 7 - man page for xsend (v7 section 1)

XSEND, XGET, ENROLL(1)		     General Commands Manual		   XSEND, XGET, ENROLL(1)

NAME
       xsend, xget, enroll - secret mail

SYNOPSIS
       xsend person
       xget
       enroll

DESCRIPTION
       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 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.

									   XSEND, XGET, ENROLL(1)


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