U2F Security Keys and Duo

Our two-factor authentication platform supports U2F security keys, offering secure login approvals resistant to phishing attacks combined with the one-tap convenience you're already used to with Duo Push.

What is U2F?

Universal 2nd Factor, or U2F, is an authentication standard developed by the FIDO Alliance that is designed to be open, secure, private, and easy to use. The a U2F security key plugs into your USB port and when tapped or when the button is pressed it sends a signed response back to Duo to validate your login. You can learn more on our U2F page.

U2F Security Key Requirements

In order to use a U2F security key with Duo, make sure you have the following:

Additionally, your administrator must enable the use of U2F tokens in Duo. Check with your organization's support team or help desk to verify that U2F is allowed if you are uncertain.

Enrolling your U2F Security Key

You can enroll your security key during the initial self-enrollment process or, if you have already enrolled in Duo using a different device (like your mobile phone), you can add your U2F token as an additional authentication device from the device management portal.

Initial Enrollment with a Security Key

Access the Duo enrollment page via a link emailed by your administrator, or when you log in for the first time to a Duo protected resource. Select Security Key from the list of devices and then click Continue.

Make sure that you're not blocking pop-up windows for the enrollment site before continuing.

The security key enrollment window automatically tries to locate your connected security key for approval.

Depending on your security key model, you'll need to tap, insert, or press a button on your device to proceed.

You'll see whether the security key identification was successful or not.

Congratulations! You have enrolled your security key.

The next time you log on using Duo, simply tap or insert your U2f security key to log in. Some types of keys flash as a prompt for you to authenticate. You do not need to explicitly select the U2F security key from the drop-down list of available devices to use it for authentication.


Adding a U2F Security Key From the Duo Prompt

If you previously enrolled other devices in Duo, you can easily add your new security key as an additional authenticator as long as your administrator has enabled Duo's self-service portal.

Navigate to your Duo-protected service and log in. At the Duo Prompt you'll see an Add a new device link on the left. Click it and approve the Duo login request using your already enrolled phone or other device.

Proceed with the U2F enrollment process as shown above in Initial Enrollment with a Security Key.

You've added your U2F security key! It is listed with your other enrolled devices.