4.3BSD-UWisc/man/cat1/xsend.1

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XSEND(1)            UNIX Programmer's Manual             XSEND(1)



NAME
     xsend, xget, enroll - secret mail

SYNOPSIS
     xsend person
     xget
     enroll

DESCRIPTION
     These commands implement a secure communication channel; it
     is like _m_a_i_l(1), but no one can read the messages except the
     intended recipient.  The method embodies a public-key cryp-
     tosystem using knapsacks.

     To receive messages, use _e_n_r_o_l_l; it asks you for a password
     that you must subsequently quote in order to receive secret
     mail.

     To receive secret mail, use _x_g_e_t.  It asks for your pass-
     word, then gives you the messages.

     To send secret mail, use _x_s_e_n_d 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 announce-
     ment of secret mail makes traffic analysis possible.



















Printed 12/27/86         April 29, 1985                         1