Flipper Zero can act as a USB universal 2nd-factor (U2F) authentication token or security key that can be used as the second authentication factor when signing in to web accounts. A security key is a small device that helps computers verify that it is you when signing in to an account. The use of this feature increases the security of your accounts.

To learn more about websites that support two-factor authentication, visit the USB-Dongle Authentication website.

Set up Flipper Zero as a security key

Before using the U2F feature, you need to register your Flipper Zero as a security key for two-factor authentication of a user on your web accounts. To add the device as a security key to your account, do the following:

1. If the qFlipper application is running on your computer, close the application.
2. Connect your Flipper Zero to the computer via a USB cable.
3. On Flipper Zero, go to Main Menu → U2F and make sure that "Connected" is displayed on the screen.
4. In your web account, activate the two-factor authentication of a user by following the website's instructions. Websites such as Google, Twitter, Facebook, GitHub, and others have different procedures for adding security keys.
5. Choose a security key as the 2nd verification step.
6. On Flipper Zero, press :ok:OK to confirm the registration of Flipper Zero as a security key.

Register as a security key



Sign in with Flipper Zero

Once you've added your Flipper Zero to your account as a security key, you can use the device as the 2nd factor. To sign in to your account with Flipper Zero, do the following:

1. If the qFlipper application is running on your computer, close the application.
2. Connect your Flipper Zero to your computer via a USB cable.
3. On Flipper Zero, go to Main Menu → U2F and make sure that "Connected" is displayed on the screen.
4. While signing in your web account, complete the 1st verification step in your account by entering the password.
5. Once the request for the security key is displayed, on Flipper Zero, press :ok:OK to confirm that it is you.

An example of Google's 2nd step verification message



U2F application source code