One-Time Password

<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".


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one-banana problem
one-line fix
one-liner wars
ones complement
One-Time Password
RFC 1760
RFC 1938
RFC 2298
One Time Programmable Read-Only Memory
one-way function
one-way hash function
On-Line Analytical Processing