3 passwd, netkey \- change or verify user password
7 .IR username [@ domain ]
13 changes the invoker's Plan 9 password and/or APOP secret.
14 The Plan 9 password is used to login to a terminal while
15 the APOP secret is used for a number of external services:
16 POP3, IMAP, and VPN access. The optional argument specifies
17 the user name and authentication domain to use if different
18 than the one associated with the machine
22 The program first prompts for the old Plan 9 password in the specified
25 It then prompts for changes to the password and the
27 New passwords and secrets must be typed twice, to forestall mistakes.
28 New passwords must be sufficiently hard to guess.
29 They may be of any length greater than seven characters.
32 prompts for a password to encrypt network challenges.
33 It is a substitute for a SecureNet box.
35 These commands may be run only on a terminal, to avoid
36 transmitting clear text passwords over the network.
38 .B /sys/src/cmd/auth/passwd.c
40 .B /sys/src/cmd/auth/netkey.c
50 Robert Morris and Ken Thompson,
51 ``UNIX Password Security,''
52 .I AT&T Bell Laboratories Technical Journal
53 Vol 63 (1984), pp. 1649-1672
57 connections are always encrypted, the only good reason
58 to require that these commands be run only on terminals
59 is concern that the CPU server might be subverted.