English Computing Dictionary
One-Time Password
(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 {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".