Google authenticator (GA)

Modified on Wed, 16 Aug 2023 at 07:16 PM

Google Authenticator is a mobile application that implements two-step verification services using the time-based one-time password algorithm and the HMAC-based one-time password algorithm for authenticating users of mobile applications by Google.

Authenticator provides a six- to eight-digit one-time password, which users must provide in addition to their username and password to log into Google services or other sites. The Authenticator can also generate codes for third-party applications, such as password managers or file hosting services. Previous versions of the software were open-sourced, but subsequent releases are proprietary.

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