S/KEY
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The S/KEY One-Time Password system originally came from Bellcore and is described in RFC 1760. It further evolved through RFC 1938 and RFC 2289 under the name "A One-Time Password System". The system uses a cryptographically strong hash function to generate a sequence of One-Time Passwords from a passphrase and a system identifier. There are several possible hash functions that can be used with the system -- MD4, MD5 and SHA -- but only MD5 is mandatory to support.