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^ "google-authenticator - Two-step verification - Google Project Hosting".^ "RFC 4226 - HOTP: An HMAC-Based One-Time Password Algorithm".^ a b Willis, Nathan (22 January 2014)." FreeOTP multi-factor authentication".^ "google-authenticator/mobile at master.
View google authenticator online android#
^ "Google Authenticator - Apps on Google Play".These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. ^ "GitHub - google/google-authenticator: Open source version of Google Authenticator (except the Android app)".^ "Google Is Making Your Account Vastly More Secure With Two-Step Authentication - TechCrunch".The currently-maintained fork of this clone is called FreeOTP+.
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įollowing Google Authenticator ceasing to be open source, a free-software clone was created, predominantly a fresh rewrite but including some code from the original. The latest open-source release was in 2020. Subsequent versions contain Google-specific workflows that are not part of the project." "This open source project allows you to download the code that powered version 2.21 of the application. Google made earlier source for their Authenticator app available on its GitHub repository the associated development page stated:
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The Google Authenticator app for Android was originally open source, but later became proprietary.
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Ĭurrent releases of the software are proprietary freeware. Yet this source code, too, has not been updated in years. Likewise, for old versions of the Google Authenticator apps for iOS and BlackBerry, the source code is also freely available. However, this fork has not been updated since 2020. Google provides Android, BlackBerry, and iOS versions of Authenticator.Īn official open-source fork of the Android app is available on GitHub. When logging into a site supporting Authenticator (including Google services) or using Authenticator-supporting third-party applications such as password managers or file hosting services, Authenticator generates a six- to eight-digit one-time password which users must enter in addition to their usual login details. Google Authenticator is a software-based authenticator by Google that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP specified in RFC 6238) and HMAC-based One-time Password algorithm (HOTP specified in RFC 4226), for authenticating users of software applications. Proprietary freeware (some versions were under Apache License 2.0)