
S/KEY is a one-time password system developed for authentication to Unix-like operating systems, especially from dumb terminals or untrusted public computers on which one does not want to type a long-term password. A user`s real password is combined in an offline device with a short set of characters and a decrementing counter to form a single-us....
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http://en.wikipedia.org/wiki/S/KEY

A one time password system, secure against replays. RFC 2289.
Found on
http://www.comptechdoc.org/independent/networking/cert/netterms.html
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