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


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 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 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, February 1998. [2] Rivest, R., "The MD5 Message-Digest Algorithm", RFC 1321, MIT and RSA Data Security, Inc, April 1992. (http://www.rfc-edi- [3] Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT, April 1992. ( [4] H. Dobbertin, A. Bosselaers, B. Preneel, "RIPEMD-160, a strengthened version of RIPEMD" cart/pdf/AB-9601/AB-9601.pdf [5] "Secure Hash Standard", National Institute of Standards and Technology, U.S. Department Of Commerce, April 1995. ( 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 []. 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 <> otp 1.0.0 otp(n)

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