one-time password system
An authentication system in which the user's private key or pass-phrase is never sent over the network but is used to calculate passwords which are unique to the user and which are different and unpredictable each time they are used. One-time password systems are designed to protect against passive attacks by preventing replay of passwords that have been captured by eavesdropping on the network. IETF Request for Comment 1938 proposes a standard for one time passwords which is derived from S/Key. (See authentication, private key cryptography, token, and two-factor authentication in the hard copy dictionary.)
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