passwd man page on Plan9

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PASSWD(1)							     PASSWD(1)

       passwd, netkey - change or verify user password

       passwd [ username[@domain] ]


       Passwd  changes	the invoker's Plan 9 password and/or APOP secret.  The
       Plan 9 password is used to login to a terminal while the APOP secret is
       used  for  a  number  of external services: POP3, IMAP, and VPN access.
       The optional argument specifies the user name and authentication domain
       to  use if different than the one associated with the machine passwd is
       run on.

       The program first prompts for the old Plan 9 password in the  specified
       domain to establish identity.  It then prompts for changes to the pass‐
       word and the secret.  New passwords and secrets must be typed twice, to
       forestall  mistakes.  New passwords must be sufficiently hard to guess.
       They may be of any length greater than seven characters.

       Netkey prompts for a password to encrypt network challenges.  It	 is  a
       substitute for a SecureNet box.

       These  commands	may  be	 run only on a terminal, to avoid transmitting
       clear text passwords over the network.


       readnvram in authsrv(2), encrypt(2), cons(3), auth(8), securenet(8)

       Robert Morris and Ken Thompson, ``UNIX Password Security,''  AT&T  Bell
       Laboratories Technical Journal Vol 63 (1984), pp. 1649-1672

       Now  that cpu connections are always encrypted, the only good reason to
       require that these commands be run only on terminals  is	 concern  that
       the CPU server might be subverted.

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