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Google Authenticator APK

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Google Authenticator APK

Google Authenticator generates 2-Step Verification codes on your phone. 2-Step Verification provides stronger security for your Google Account by requiring a second step of verification when you sign in. In addition to your password, you’ll also need a code generated by the Google Authenticator app on your phone.

Features:
* Generate verification codes without a data connection
* Google Authenticator works with many providers & accounts
* Dark theme available
* Automatic setup via QR code
* Transfer accounts between devices via QR code

Permission notice:
Camera: Needed to add accounts using QR codes

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.

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.

Previous versions of the software were open-source but since 2013 releases are proprietary.

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Typical use case

To use Authenticator, the app is first installed on a smartphone. 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, which computes (but does not display) the required six-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 not sufficient 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 computer used for the login process is compromised by a trojan, then username, password and one-time password can be captured by the trojan, which can then initiate its own login session to the site or monitor and modify the communication between user and site.

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