1otp(n)                RFC 2289 A One-Time Password System               otp(n)
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NAME

8       otp - One-Time Passwords
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SYNOPSIS

11       package require Tcl  8.2
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13       package require otp  ?1.0.0?
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15       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data
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17       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data
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19       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data
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21       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data
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DESCRIPTION

26       This  package is an implementation in Tcl of the One-Time Password sys‐
27       tem as described in RFC 2289 (1). This system uses message-digest algo‐
28       rithms  to  sequentially  hash  a passphrase to create single-use pass‐
29       words. The resulting data is then provided to the user as either  hexa‐
30       decimal digits or encoded using a dictionary of 2048 words. This system
31       is used by OpenBSD for secure login and can be used as a SASL mechanism
32       for authenticating users.
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34       In  this implementation we provide support for four algorithms that are
35       included in the tcllib distribution: MD5 (2), MD4 (3),  RIPE-MD160  (4)
36       and SHA-1 (5).
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COMMANDS

39       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data
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41       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data
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43       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data
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45       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data
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EXAMPLES

48       % otp::otp-md5 -count 99 -seed host67821 "My Secret Pass Phrase"
49       (binary gibberish)
50       % otp::otp-md5 -words -count 99 -seed host67821 "My Secret Pass Phrase"
51       SOON ARAB BURG LIMB FILE WAD
52       % otp::otp-md5 -hex -count 99 -seed host67821 "My Secret Pass Phrase"
53       e249b58257c80087
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REFERENCES

57       [1]    Haller,  N. et al., "A One-Time Password System", RFC 2289, Feb‐
58              ruary 1998.  http://www.rfc-editor.org/rfc/rfc2289.txt
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60       [2]    Rivest, R., "The MD5 Message-Digest Algorithm",  RFC  1321,  MIT
61              and  RSA  Data  Security, Inc, April 1992.  (http://www.rfc-edi‐
62              tor.org/rfc/rfc1321.txt)
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64       [3]    Rivest, R., "The MD4 Message Digest Algorithm", RFC  1320,  MIT,
65              April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)
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67       [4]    H.   Dobbertin,   A.  Bosselaers,  B.  Preneel,  "RIPEMD-160,  a
68              strengthened   version   of    RIPEMD"    http://www.esat.kuleu‐
69              ven.ac.be/~cosicart/pdf/AB-9601/AB-9601.pdf
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71       [5]    "Secure  Hash  Standard",  National  Institute  of Standards and
72              Technology,   U.S.   Department   Of   Commerce,   April   1995.
73              (http://www.itl.nist.gov/fipspubs/fip180-1.htm)
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SEE ALSO

76       SASL, md4, md5, ripemd160, sha1
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KEYWORDS

79       hashing, message-digest, password, rfc 2289, security
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82       Copyright (c) 2006, Pat Thoyts <patthoyts@users.sourceforge.net>
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87otp                                  1.0.0                              otp(n)
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