Google Authenticator (Google Authentication System) supports inter-device synchronization of login information and backup has become very easy, so I tried to summarize the synchronization procedure
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Many people use one-time passwords using ' Google Authenticator' to improve the security of web applications. However, Google Authenticator has not been equipped with the synchronization function of the information required for login for a long time, and there was a problem that `` if the device is stolen or lost, you will not be able to log in to your account ''. Newly, Google Authenticator supports synchronization via a Google account, and even if the device is lost, it is now possible to check the one-time password from another device, so I checked the setting method.
Google Online Security Blog: Google Authenticator now supports Google Account synchronization
Google Authenticator is an application that can issue one-time passwords, and by using it together with regular passwords, you can greatly enhance security. This time, I will try using the synchronization function via the Google account newly installed in Google Authenticator.
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When you update Google Authenticator and start it, the guidance screen for the synchronization function will be displayed, so tap 'Start'.
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If you are using a Google account with a Google-based application such as Gmail, the button 'Continue as ○○' will be displayed, so tap it.
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A green check mark and the name of your Google account will appear in the upper right corner of the screen. Cloud sync is now started.
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Next, prepare another iPhone and install Google Authenticator from the App Store .
After installing and starting Google Authenticator, tap 'Login' at the bottom of the screen.
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When the following screen is displayed, tap 'Continue'.
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Enter your email address and tap 'Next'.
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Enter the password and tap 'Next'.
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If the login is successful, the login information registered on the first smartphone will be displayed.
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When you put two smartphones side by side and start Google Authenticator, it looks like this. You can see that the same one-time password is generated at the same timing.
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If you want to cancel synchronization, tap the icon at the top right of the screen.
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Then tap 'Use Authenticator without an account'.
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Tap 'Continue'.
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You have now unsynced.
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・Continued
It turns out that the backup function of Google Authenticator is not E2E encrypted and is likely to be exposed to serious security risks - GIGAZINE
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