One-time passwords can be used for only one authentication process in order to gain access to a system. By using one-time passwords, the probability of an attack relying on the interception and replay of network traffic is lessened because a previously valid password will not be accepted on a second or following round. One-time passwords are typically used in security-­critical environments in which clear-text passwords continue to be used.

See Also: Attack; Authentication; Password; Security.