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



____________________________________________________________________________________________________________

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

____________________________________________________________________________________________________________

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

       In this implementation we provide support for four algorithms that are included in the tcllib distri-bution: distribution:
       bution: 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, February 1998.  http://www .rfc-edi-
              tor.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-editor.org/rfc/rfc1321.txt)

       [3]    Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT,  April  1992.  (http://www .rfc-
              editor.org/rfc/rfc132_.txt

       [4]    H.  Dobbertin,  A.  Bosselaers,  B.  Preneel,  "RIPEMD-160,  a strengthened version of RIPEMD"
              http://www.esat.kuleuven.ac.be/~cosicart/pdf/AB-96_1/AB-96_1.pdf

       [5]    "Secure Hash Standard", National Institute of Standards and  Technology,  U.S.  Department  Of
              Commerce, April 1995.  (http://www.itl.nist.gov/fipspubs/fip18_-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://source -
       forge.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>




otp                                                 1.0.0                                             otp(n)