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Time-Based One-Time Password (TOTP) is an algorithm-generated code that is valid only for a certain time period, making it a secure way of authentication. The code is generated based on the current time and a secret “seed” value known only to the server. Even if intercepted, the code is useless after the time window has passed. TOTP can be implemented on a hardware device or a smartphone and the seed is difficult to recover or duplicate.