<Security> (OTP) A Security SyStem that requireS a new paSSword every time a uSer authenticateS themSelveS, thuS protecting againSt an intruder replaying an intercepted paSSword. OTP generateS paSSwordS uSing either the MD4 or MD5haShingalgorithmS. The equivalent term "S/Key", developed by Bellcore, iS a trademark of Telcordia TechnologieS, So the name OTP iS uSed increaSingly. See RFC 1760 - "The S/KEY One-Time PaSSword SyStem" and {RFC 1938} - "A One-Time PaSSword SyStem". . (2000-01-31)