1 .\" opiekey.1: Manual page for the opiekey(1) program.
3 .\" %%% portions-copyright-cmetz-96
4 .\" Portions of this software are Copyright 1996-1999 by Craig Metz, All Rights
5 .\" Reserved. The Inner Net License Version 2 applies to these portions of
7 .\" You should have received a copy of the license with this software. If
8 .\" you didn't get a copy, you may request one from <license@inner.net>.
10 .\" Portions of this software are Copyright 1995 by Randall Atkinson and Dan
11 .\" McDonald, All Rights Reserved. All Rights under this copyright are assigned
12 .\" to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
13 .\" License Agreement applies to this software.
17 .\" Modified by cmetz for OPIE 2.3. Added -t documentation. Removed
18 .\" opie-bugs pointer. Removed opie-md5 and opie-md4 names. Fixed
19 .\" a bolding bug. Added -f flag. Added escapes on flags. Minor
20 .\" editorial changes. Updated example.
21 .\" Modified by cmetz for OPIE 2.2. Removed MJR DES documentation.
22 .\" Re-worded retype documentation. Added opiegen reference.
23 .\" Added -x documentation.
24 .\" Modified at NRL for OPIE 2.0.
25 .\" Written at Bellcore for the S/Key Version 1 software distribution
28 .\" $FreeBSD: src/contrib/opie/opiekey.1,v 1.3.6.3 2002/07/15 14:48:43 des Exp $
29 .\" $DragonFly: src/contrib/opie/opiekey.1,v 1.2 2003/06/17 04:24:05 dillon Exp $
33 .TH OPIEKEY 1 "February 20, 1996"
36 opiekey, otp-md4, otp-md5 \- Programs for computing responses to OTP challenges.
44 [\-v] [\-h] [\-f] [\-x]
53 .I sequence_number seed
58 takes the optional count of the number of responses to
59 print along with a (maximum) sequence number and seed as command line
60 args. It prompts for the user's secret pass phrase and produces an OPIE
61 response as six words. If compiled to do so, it can prompt for the user's
62 secret pass phrase twice to help reduce errors due to mistypes. The second
63 password entry can be circumvented by entering only an end of line.
65 is downward compatible with the
67 program from the Bellcore S/Key Version 1 distribution and several of its
73 Display the version number and compile-time options, then exit.
76 Display a brief help message and exit.
79 Selects MD4 or MD5, respectively, as the response generation algorithm. The
80 default for otp-md4 is MD4 and the default for opie-md5 is MD5. The default
81 for opiekey depends on compile-time configuration, but should be MD5. MD4 is
82 compatible with the Bellcore S/Key Version 1 distribution.
87 to continue, even where it normally shouldn't. This is currently used to
88 force opiekey to operate in even from terminals it believes to be insecure.
89 It can also allow users to disclose their secret pass phrases to attackers.
90 Use of the -f flag may be disabled by compile-time option in your particular
94 Allows you to input an arbitrary secret pass phrase, instead of running checks
95 against it. Arbitrary currently does not include '\\0' or '\\n' characters. This
96 can be used for backwards compatibility with key generators that do not check
100 the number of one time access passwords to print.
104 Output the OTPs as hexadecimal numbers instead of six words.
107 Generate an extended response of the specified type. Supported types are:
113 init hexadecimal re-initialization
115 init-word six-word re-initialization
117 The re-initialization responses
119 generate the simple active attack protection.
123 wintermute$ opiekey \-5 \-n 5 495 wi01309
125 Using MD5 algorithm to compute response.
127 Reminder: Don't use opiekey from telnet or dial-in sessions.
129 Enter secret pass phrase:
131 491: HOST VET FOWL SEEK IOWA YAP
133 492: JOB ARTS WERE FEAT TILE IBIS
135 493: TRUE BRED JOEL USER HALT EBEN
137 494: HOOD WED MOLT PAN FED RUBY
139 495: SUB YAW BILE GLEE OWE NOR
146 can lull a user into revealing his/her password when remotely logged in, thus
147 defeating the purpose of OPIE. This is especially a problem with xterm.
149 implements simple checks to reduce the risk of a user making
150 this mistake. Better checks are needed.
165 Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden
166 of Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and
169 S/Key is a trademark of Bell Communications Research (Bellcore).
172 OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join,
173 send an email request to:
175 skey-users-request@thumper.bellcore.com