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Will using WebAuthn for an application make it two factor? I am specifically interested in using Ondevice biometrics and achieve passwordless authentication.

For a true two factor authentication you need one to use two of the three forms of authentication: "something you know", "something you have" and "something you are".

When using WebAuthn using on-device biometrics, can we call the device that I am using to access the portal as "something you have" and the biometric as "something you are"?

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I think it depends if you are limiting access to your service by devices by some reasonable method.

If you have to use a domain joined laptop then probably yes. If you are using an app on a mobile device, then using the native biometrics capability to encrypt a secret then probably yes.

  • Thanks @ste-fu .That helps. Also, in order to compromise my access a bad actor will need to possess both my device (since I had enrolled my biometrics only on that device) and my biometric (e.,g fingerprint) - thus making it a two factor authentication. – Nataraj Rao Dec 13 '18 at 12:28

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