usr/man/cat1/xsend.0



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


N\bNA\bAM\bME\bE
     xsend, xget, enroll - secret mail

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     x\bxs\bse\ben\bnd\bd person
     x\bxg\bge\bet\bt
     e\ben\bnr\bro\bol\bll\bl

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     These commands implement a secure communication channel; it
     is like _\bm_\ba_\bi_\bl(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 _\be_\bn_\br_\bo_\bl_\bl; it asks you for a password
     that you must subsequently quote in order to receive secret
     mail.

     To receive secret mail, use _\bx_\bg_\be_\bt.  It asks for your pass-
     word, then gives you the messages.

     To send secret mail, use _\bx_\bs_\be_\bn_\bd 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.

F\bFI\bIL\bLE\bES\bS
     /usr/spool/secretmail/*.key: keys
     /usr/spool/secretmail/*.[0-9]: messages

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     mail (1)

B\bBU\bUG\bGS\bS
     It should be integrated with ordinary mail.  The announce-
     ment of secret mail makes traffic analysis possible.


Printed 7/9/88           April 29, 1985                         1