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Yes, it is WebAuthn + iCloud storage of the client credentials.

• arianvanp 4y ago
  Note that Microsoft and Google also agreed to the Passkey terminology and will be adopting it in all their Webauthn-related UIs
  • EtienneK 4y ago
    Being very pedantic: "passkey" is spelt with a lowercase "p" like with "password".
  • throw0101c 4y ago
    Also, there is a draft being working on for credentials transfer: This document describes a mechanism to transfer digital credentials securely between two devices. Secure credentials may represent a digital key to a hotel room, a digital key to a door lock in a house or a digital key to a car. Devices that share credentials may belong to the same or two different platforms (e.g. iOS and Android). Secure transfer may include one or more write and read operations. Credential transfer needs to be performed securely due to the sensitive nature of the information. * https://datatracker.ietf.org/doc/html/draft-secure-credential-transfer https://datatracker.ietf.org/doc/html/draft-secure-credentia...