Time-based one-time password

Aegis Authenticator, showing time-based one-time passwords

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.[1]

TOTP is a cornerstone of the Initiative for Open Authentication (OATH) and is used in a number of two-factor authentication (2FA) systems.

  1. ^ m'Raihi, David; Rydell, Johan; Pei, Mingliang; Machani, Salah (May 2011). "RFC 6238 – TOTP: Time-Based One-Time Password Algorithm". Archived from the original on July 11, 2011. Retrieved July 13, 2011.

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