FIDO2 CTAP

FIDO2 client <-> authenticator protocol.

Definition

CTAP 2.1 supports PIN, biometrics, large credentials storage, cross-platform. CTAP 2.2 introduces hybrid transport (caBLE Cross-platform Authentication via Bluetooth Low Energy) for cross-platform Passkeys. Compatible with W3C WebAuthn Level 3 spec. Implemented by YubiKey, Google Titan, Microsoft platform authenticator, Apple Face ID / Touch ID.

Origin

FIDO Alliance, CTAP 1.0 2018, CTAP 2.1 2021, CTAP 2.2 draft 2024.

Usage

Foundation standard for cross-platform passkeys Apple / Google / Microsoft (March 2022 announcement, GA 2023).

Related terms

• FIDO2 — cadre parent.
• WebAuthn Level 3 — spec serveur jumelle.
• Passkeys — pattern d'usage.