Passkey (WebAuthn)

A phishing-resistant passwordless authentication credential based on public-key cryptography, standardized by the FIDO2 and WebAuthn (W3C) specifications. During registration, the authenticator (device, OS, or password manager) generates a public/private key pair; the public key is stored by the relying party. During authentication, the device signs a server challenge with the private key, which never leaves the device. Passkeys are synchronized across devices via iCloud Keychain, Google Password Manager, or 1Password.