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Security Keys (U2F)
Authelia also offers authentication using Security Keys supporting U2F like Yubikey USB devices. U2F is one of the most secure authentication protocol and is already available for Google, Facebook, Github accounts and more.
The protocol requires your security key being enrolled before authenticating.
To do so, select the Security Key method in the second factor page and click on the register new device link. This will send a link to the user email address. This e-mail will likely be sent to https://mail.example.com:8080/ if you're testing Authelia and you've not configured anything.
Confirm your identity by clicking on Continue and you'll be asked to touch the token of your security key to enroll.
Upon successful registration, you can authenticate using your security key by simply touching the token again.
Easy, right?!
FAQ
Why don't I have access to the Security Key option?
U2F protocol is a new protocol that is only supported by recent browser and must even be enabled on some of them like Firefox. Please be sure your browser supports U2F and that the feature is enabled to make the option available in Authelia.