Provided by: opie-client_2.40~dfsg-0ubuntu1_i386 bug

NAME

       opiekey,  otp-md4,  otp-md5  -  Programs for computing responses to OTP
       challenges.

SYNOPSIS

       opiekey | otp-md4 | otp-md5 [-v] [-h] [-f] [-x]
       [-t type ] [-4|-5] [-a] [-n count ] sequence_number seed

DESCRIPTION

       opiekey 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 is downward compatible with the key(1)  program  from
       the  Bellcore S/Key Version 1 distribution and several of its variants.

OPTIONS

       -v     Display the version number and compile-time options, then  exit.

       -h     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 distribution.

       -f     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.

       -a     Allows you to input an arbitrary secret pass phrase, instead  of
              running  checks against it. Arbitrary currently does not include
              ’ ’  or  ’0  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.

       -x     Output the OTPs as hexadecimal numbers instead of six words.

       -t <type>
              Generate an extended response of the specified  type.  Supported
              types are:

              word           six-word
              hex            hexadecimal
              init           hexadecimal re-initialization
              init-word      six-word re-initialization

              The  re-initialization  responses  always  generate  the  simple
              active attack protection.

       EXAMPLE
              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
              wintermute$

BUGS

       opiekey(1) 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.

SEE ALSO

       opie(4),   opiepasswd(1),   opieinfo(1),    opiesu(1),    opielogin(1),
       opieftpd(8), opiekeys(5), opieaccess(5), opiegen(1)

AUTHOR

       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 Metz.

       S/Key is a trademark of Bell Communications Research (Bellcore).

CONTACT

       OPIE  is discussed on the Bellcore "S/Key Users" mailing list. To join,
       send an email request to:

       skey-users-request@thumper.bellcore.com