google authenticator

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      Google Authenticator is a software-based authenticator by Google. It implements multi-factor authentication services using the time-based one-time password (TOTP; specified in RFC 6238) and HMAC-based one-time password (HOTP; specified in RFC 4226), for authenticating users of software applications.
      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 provides Android, Wear OS, BlackBerry, and iOS versions of Authenticator.
      An official open source fork of the Android app is available on GitHub. However, this fork was archived in Apr 6, 2021 and is now read only.
      Current software releases are proprietary freeware.


      Typical use case



      The app is first installed on a smartphone to use Authenticator. It must be set up for each site with which it is to be used: the site provides a shared secret key to the user over a secure channel, to be stored in the Authenticator app. This secret key will be used for all future logins to the site.
      To log into a site or service that uses two-factor authentication and supports Authenticator, the user provides a username and password to the site. The site then computes (but does not display) the required six- to eight-digit one-time password and asks the user to enter it. The user runs the Authenticator app, which independently computes and displays the same password, which the user types in, authenticating their identity.
      With this kind of two-factor authentication, mere knowledge of username and password is insufficient to break into a user's account - the attacker also needs knowledge of the shared secret key or physical access to the device running the Authenticator app. An alternative route of attack is a man-in-the-middle attack: if the device used for the login process is compromised by malware, the credentials and one-time password can be intercepted by the malware, which then can initiate its login session to the site, or monitor and modify the communication between the user and the site.


      Technical description


      During setup, the service provider generates an 80-bit secret key for each user (whereas RFC 4226 §4 requires 128 bits and recommends 160 bits). This is transferred to the Authenticator app as a 16, 26, or 32-character base32 string, or as a QR code.
      Subsequently, when the user opens the Authenticator app, it calculates an HMAC-SHA1 hash value using this secret key. The message can be:

      The number of 30-second periods since the Unix epoch (TOTP) as 64-bit big endian integer; or
      A counter that is incremented with each new code (HOTP).
      A portion of the HMAC is extracted and displayed to the user as a six- to eight-digit code; The last nibble (4 bits) of the result is used as a pointer, to a 32-bit integer, in the result byte array, and masks out the 31st bit.


      License


      The Google Authenticator app for Android was originally open source, but later became proprietary. Google made earlier source for their Authenticator app available on its GitHub repository; the associated development page stated:

      "This open source project allows you to download the code that powered version 2.21 of the application. Subsequent versions contain Google-specific workflows that are not part of the project."
      The latest open-source release was in 2020.


      See also


      Multi-factor authentication
      HMAC-based one-time password
      FreeOTP
      LinOTP
      Comparison of OTP applications


      References




      External links


      Google Authenticator on Google Help
      Google Authenticator (Android) and Google Authenticator (other) legacy source code on GitHub
      Google Authenticator PAM module source code on GitHub
      Google Authenticator implementation in Python on Stack Overflow
      Django-MFA Implementation Using Google Authenticator - Django-MFA is a simple package to add an extra layer of security to your Django web application. It gives your web app a randomly changing password as extra protection.
      Source code of version 1.02 on GitHub

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    Get verification codes with Google Authenticator

    Organize your Google Authenticator codes. To organize your Authenticator codes, touch and hold any code, then drag to reorder to a desired location. You can also use the search bar to find the code you need. To search through your Google Authenticator codes, enter any text matching the username to find the code. Delete your Google Authenticator ...

    Google OTP로 인증 코드 받기 - Android - Google 계정 고객센터

    Google OTP 서비스를 삭제하면 다음과 같은 결과가 발생합니다. OTP 코드가 Google 계정에서 삭제됩니다. 모든 기기에서 OTP 코드를 사용할 수 없게 됩니다. 전체 Google 계정은 삭제되지 않습니다. 전체 Google 계정을 삭제하면 Google OTP 코드도 삭제됩니다.

    Google 認証システムで確認コードを取得する

    Google アカウントへのコードの保存を開始するよう求めるメッセージが表示されたら、[許可] をタップします。 Google 認証システムのコードを編集する. Android で認証システムのコードを編集するには、コードを左にスワイプして編集オプションを表示します。

    Bestätigungscodes mit Google Authenticator abrufen

    Google Authenticator ohne Google-Konto verwenden. Mit Google Authenticator können Sie Ihre Codes sicher in Ihrem Google-Konto speichern. Das hilft dabei, zu verhindern, dass Sie beim Wechseln des Geräts den Zugriff auf Ihr Konto verlieren. Sie können Google Authenticator aber auch ohne diese Vorkehrung nutzen.

    Turn on 2-Step Verification - Computer - Google Account Help

    Use Google Authenticator or other verification code apps Important: Never give your verification codes to anyone. When you don't have an internet connection or mobile service, you can set up Google Authenticator or another app that creates one-time verification codes.

    Verificatiecodes krijgen met Google Authenticator

    Google Authenticator gebruiken zonder Google-account. Met Google Authenticator kun je je codes beveiligd opslaan in je Google-account. Zo voorkom je dat je de toegang tot je account kwijtraakt als je van apparaat wisselt. Je kunt er ook voor kiezen Google Authenticator te gebruiken zonder deze beveiligingsmaatregelen.

    Receber códigos de verificação com o Google Authenticator

    Usar o Google Authenticator sem uma Conta do Google. Você pode salvar seus códigos com segurança na sua Conta do Google usando o Google Authenticator. Isso ajuda a impedir que você perca o acesso quando muda de dispositivo. No entanto, você pode usar o Google Authenticator sem essas proteções.

    Obtener códigos de verificación con Google Authenticator

    Usar Google Authenticator sin una cuenta de Google. Puedes guardar tus códigos de forma segura en tu cuenta de Google con Google Authenticator. De este modo, evitarás que se te bloquee el acceso a tu cuenta cuando cambies de dispositivo. Sin embargo, puedes usar Google Authenticator sin estas protecciones.

    الحصول على رموز تحقُّق باستخدام Google Authenticator

    يتيح لك تطبيق Google Authenticator حفظ الرموز بأمان في حسابك على Google. ويساعد ذلك في تجنُّب حظر دخولك إلى حسابك عند التبديل بين الأجهزة. ويمكنك أيضًا اختيار استخدام Google Authenticator بدون هذه التدابير الوقائية.

    Generowanie kodów weryfikacyjnych za pomocą aplikacji Google …

    Korzystanie z aplikacji Google Authenticator bez konta Google. Za pomocą aplikacji Google Authenticator możesz bezpiecznie zapisywać kody na koncie Google. Dzięki temu nie utracisz dostępu do konta po zmianie urządzenia. Możesz jednak używać aplikacji Google Authenticator bez tych zabezpieczeń.