Time-based one-time password
Password authentication algorithm
Time-based one-time password
Time-based one-time password (TOTP) is a computer algorithm that generates a one-time password (OTP) using the current time as a source of uniqueness. As an extension of the HMAC-based one-time password (HOTP) algorithm, it has been adopted as Internet Engineering Task Force (IETF) standard RFC 6238. TOTP is a cornerstone of the Initiative for Open Authentication (OATH) and is used in a number of two-factor authentication (2FA) systems.
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