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Time-Based One-Time Password

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Time-based One-Time Password - Wikipedia

Time-based One-time Password (TOTP) is a computer algorithm that generates a one-time password (OTP) which uses the current time as a source of uniqueness. An extension of the HMAC-based One-time Password algorithm (HOTP), it has been adopted as Internet Engineering Task Force (IETF) standard RFC 6238.

https://en.wikipedia.org/wiki/Time-based_One-Time_Password

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