Google introduced WebAuthn https://developers.google.com/web/updates/2018/05/webauthn two years back.
Is it possible to accurately identify the finger that a user registered or verified?
For instance, the server could not only obtain the public key but also receive a unique random number associated with the finger that the user registered. This would prevent multiple people from using the same device to authenticate for one user ID.
In short, the answer is a resounding no.
When FIDO2 was created, privacy was a top priority. This means that it is practically impossible to track whether the same device was used to generate a key, let alone accessing any information about the biometric security measures safeguarding the private key.
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