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Time synchronous authentication refers to a type of Two Factor Authentication (TF-A) method that uses synchronous or time-synchronized tokens for authentication.
The intended synchronous tokens are time-synchronized with an authentication server in order to create a One-Time Password (OTP). The server and the token have individual clocks that should be synchronized to the exact same timebase.
The generated OTP is valid only for a short time period. If the difference between the authenticator clock and the token clock is too great, then the password authentication will not be accurate.
The other two types of TF-A used in networks are challenge response authentication and event synchronous authentication.