If the right credentials are found, the client or browser prompts the user to apply their fingertip to the YubiKey Bio’s sensor.The client makes a request to the YubiKey to see if any credentials on the key have been registered for use with this site or service.The client or browser prompts the user to insert the YubiKey.When the user authenticates to the site or service, To achieve it, discoverable credentials must be used. This scenario provides the best user experience by enabling a passwordless flow backed by strong authentication. For information on how and why the fingerprint might not “work”, see Tips. The “working” of the fingerprint is described in the following. Otherwise the user must unblock biometrics by using either: With fallback to PIN, it is easy if the user is authenticating to a WebAuthn/FIDO2 site, because the browser/client app can prompt for the PIN. When the fingerprint does not work and the key falls back to the PIN, it is the key that needs the PIN for authentication to all sites, including U2F sites (even though U2F has no concept of PIN). The YubiKey Bio needs to have the PIN as a fallback in case it cannot recognize your fingerprint.Īlthough there are two FIDO applications on the YubiKey Bio, namely FIDO2 and U2F, it is the FIDO2 PIN that is required as fallback for both. Before you can start using the YubiKey Bio with services and applications, you need to first set a FIDO2 PIN and then enroll at least one fingerprint.
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