


otp(n)         RFC 2289 A One-Time Password System         otp(n)


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NAME
       otp - One-Time Passwords

SYNOPSIS
       package require Tcl  8.2

       package require otp  ?1.0.0?

       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data

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DESCRIPTION
       This  package is an implementation in Tcl of the One-Time Password sys-
       tem as described in RFC 2289 (1). This system uses message-digest algo-
       rithms  to  sequentially  hash  a passphrase to create single-use pass-
       words. The resulting data is then provided to the user as  either  hex-
       adecimal  digits or encoded using a dictionary of 2048 words. This sys-
       tem is used by OpenBSD for secure login and can be used as a SASL mech-
       anism for authenticating users.

       In  this implementation we provide support for four algorithms that are
       included in the tcllib distribution: MD5 (2), MD4 (3),  RIPE-MD160  (4)
       and SHA-1 (5).

COMMANDS
       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data


EXAMPLES
       % otp::otp-md5 -count 99 -seed host67821 "My Secret Pass Phrase"
       (binary gibberish)
       % otp::otp-md5 -words -count 99 -seed host67821 "My Secret Pass Phrase"
       SOON ARAB BURG LIMB FILE WAD
       % otp::otp-md5 -hex -count 99 -seed host67821 "My Secret Pass Phrase"
       e249b58257c80087


REFERENCES
       [1]    Haller,  N.  et  al.,  "A  One-Time  Password System", RFC 2289,



otp                           1.0.0                             1





otp(n)         RFC 2289 A One-Time Password System         otp(n)


              February 1998.  http://www.rfc-editor.org/rfc/rfc2289.txt

       [2]    Rivest, R., "The MD5 Message-Digest Algorithm",  RFC  1321,  MIT
              and  RSA  Data  Security, Inc, April 1992.  (http://www.rfc-edi-
              tor.org/rfc/rfc1321.txt)

       [3]    Rivest, R., "The MD4 Message Digest Algorithm", RFC  1320,  MIT,
              April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)

       [4]    H.   Dobbertin,   A.  Bosselaers,  B.  Preneel,  "RIPEMD-160,  a
              strengthened   version   of    RIPEMD"    http://www.esat.kuleu-
              ven.ac.be/~cosicart/pdf/AB-9601/AB-9601.pdf

       [5]    "Secure  Hash  Standard",  National  Institute  of Standards and
              Technology,   U.S.   Department   Of   Commerce,   April   1995.
              (http://www.itl.nist.gov/fipspubs/fip180-1.htm)


BUGS, IDEAS, FEEDBACK
       This  document,  and the package it describes, will undoubtedly contain
       bugs and other problems.  Please report such in the category otp of the
       Tcllib  SF  Trackers  [http://sourceforge.net/tracker/?group_id=12883].
       Please also report any ideas for enhancements you may have  for  either
       package and/or documentation.

SEE ALSO
       SASL, md4, md5, ripemd160, sha1

KEYWORDS
       hashing, message-digest, password, rfc 2289, security

CATEGORY
       Hashes, checksums, and encryption

COPYRIGHT
       Copyright (c) 2006, Pat Thoyts <patthoyts@users.sourceforge.net>





















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