opiekey, otp-md4, otp-md5 - Programs for computing responses to OTP challenges.
[-v] [-h] [-f] [-x]
] [-4|-5] [-a] [-n count
] sequence_number seed
takes the optional count of the number of responses to print
along with a (maximum) sequence number and seed as command line args. It
prompts for the user's secret pass phrase and produces an OPIE response as six
words. If compiled to do so, it can prompt for the user's secret pass phrase
twice to help reduce errors due to mistypes. The second password entry can be
circumvented by entering only an end of line. opiekey
compatible with the key
(1) program from the Bellcore S/Key Version 1
distribution and several of its variants.
- Display the version number and compile-time options, then exit.
- Display a brief help message and exit.
- -4, -5
- Selects MD4 or MD5, respectively, as the response generation algorithm.
The default for otp-md4 is MD4 and the default for opie-md5 is MD5. The
default for opiekey depends on compile-time configuration, but should be
MD5. MD4 is compatible with the Bellcore S/Key Version 1
- Force opiekey to continue, even where it normally shouldn't. This
is currently used to force opiekey to operate in even from terminals it
believes to be insecure. It can also allow users to disclose their secret
pass phrases to attackers. Use of the -f flag may be disabled by
compile-time option in your particular build of OPIE.
- Allows you to input an arbitrary secret pass phrase, instead of running
checks against it. Arbitrary currently does not include '\0' or '\n'
characters. This can be used for backwards compatibility with key
generators that do not check passwords.
- -n <count>
- the number of one time access passwords to print. The default is one.
- Output the OTPs as hexadecimal numbers instead of six words.
- -t <type>
- Generate an extended response of the specified type. Supported types are:
init hexadecimal re-initialization
init-word six-word re-initialization
The re-initialization responses always generate the simple active
wintermute$ opiekey -5 -n 5 495 wi01309
Using MD5 algorithm to compute response.
Reminder: Don't use opiekey from telnet or dial-in sessions.
Enter secret pass phrase:
491: HOST VET FOWL SEEK IOWA YAP
492: JOB ARTS WERE FEAT TILE IBIS
493: TRUE BRED JOEL USER HALT EBEN
494: HOOD WED MOLT PAN FED RUBY
495: SUB YAW BILE GLEE OWE NOR
can lull a user into revealing his/her password when remotely
logged in, thus defeating the purpose of OPIE. This is especially a problem
with xterm. opiekey(1)
implements simple checks to reduce the risk of a
user making this mistake. Better checks are needed.
Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden of
Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and Craig
S/Key is a trademark of Bell Communications Research (Bellcore).
OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join,
send an email request to: