Authenticators
What is an authenticator?
An Authenticator is a cryptographic entity used to generate a public key credential and registered by a Relying Party (i.e. an application). This public key is used to authenticate by potentially verifying a user in the form of an authentication assertion and other data.
Authenticators may have additional features such as PIN code or biometric sensors (fingerprint, facial recognition…) that offer user verification.
Roaming Authenticators
The roaming authenticator may have different forms. The most common form is a USB device the user plugs into its computer. It can be a paired Bluetooth device or a card with NFC capabilities.
Authenticators of this class are removable from, and can "roam" among, client devices.
Platform Authenticators
A platform authenticator is usually not removable from the client device. For example an Android smartphone or a Windows 10 computer with the associated security chips can act as an authenticator.
Passkey
Passkey are virtual authenticators that have extended capabilities and in particular:
Synchronized and stored in an integrated password manager (e.g., iCloud Keychain, Google Password Manager).
Simple and integrated use, no need for an external device.
Seamless synchronization across different user devices.
Backed up automatically through the associated cloud service, allowing easy recovery if a device is lost or replaced.
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