One-Time Password

security (OTP) A security system that requires a new

password every time a user authenticates themselves. OTP

generates these passwords using either the MD4 or MD5

hashing algorithms.

The equivalent term "S/Key" is a trademark of TelcordiaTechnologies, so the name OTP is used increasingly.

See RFC 1760 - "The S/KEY One-Time Password System" and RFC1938 - "A One-Time Password System".

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(2000-01-31)