one-time password

from The Free On-line Dictionary of Computing (8 July 2008)

One-Time Password
S/Key

   <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
   {MD5} {hashing} {algorithms}.

   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".

   (http://cs.umd.edu/~harry/jotp/).

   (2000-01-31)