How FIDO U2F works - Yubico
https://docs.yubico.com/yesdk/users-manual/application-u2f/how-u2f-works.html
WEBHow FIDO U2F works. At its foundation, there are two FIDO U2F operations: Registration; Authentication; First, the user registers the YubiKey and ties it to a particular account. Second, when logging on, the user makes sure the appropriate YubiKey is inserted.
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