![]() ![]() The server then also runs TOTP to verify the entered one-time password. In a typical two-factor authentication application, user authentication proceeds as follows: a user enters username and password into a website or other server, generates a one-time password for the server using TOTP running locally on a smartphone or other device, and types that password into the server as well. Because network latency and out-of-sync clocks can result in the password recipient having to try a range of possible times to authenticate against, the timestamp typically increases in 30-second intervals, which thus cuts the potential search space. It combines a secret key with the current timestamp using a cryptographic hash function to generate a one-time password. TOTP is an example of a hash-based message authentication code (HMAC). ![]() It has been adopted as Internet Engineering Task Force is the cornerstone of Initiative For Open Authentication (OATH), and is used in a number of two-factor authentication systems. The Time-based One-Time Password algorithm ( TOTP) is an algorithm that computes a one-time password from a shared secret key and the current time. ![]()
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