Why can I use macOS passkeys without biometrics

macOS passkeys can be used without biometrics due to their design under the FIDO2/WebAuthn standards, Apple's security architecture, and accessibility considerations. Here’s why:

1. FIDO2 Standards Allow Multiple Verification Methods

Passkeys are built on the FIDO2 framework, which requires User Verification (UV) but does not mandate biometrics. UV can be achieved through: M1. Your macOS account password M2. Biometrics (Touch ID/Face ID, if available) M3. Apple Watch proximity unlock (where supported)

2. macOS Keychain & Secure Enclave Security

Passkeys are stored in the macOS Keychain, which is: M1. Encrypted and unlocked by your macOS account password by default (biometrics are a convenience layer) M2. Backed by the Secure Enclave hardware chip, keeping private keys protected whether unlocked via password or biometrics M3. Still secure with a strong password—FIDO2 treats this as equally valid to biometrics for UV

3. Accessibility and Device Compatibility

Non-biometric access is critical because: M1. Not all Macs have Touch ID/Face ID (e.g., older or desktop models) M2. Biometrics may fail (wet fingers, low light) or be inaccessible to users with disabilities (hand tremors, skin conditions) M3. Legal requirements (e.g., ADA, EU Accessibility Act) necessitate alternative input methods

Security Note

The use of passwords doesn’t weaken passkey security: M1. Private keys never leave your device M2. Authentication relies on cryptographic proof (signed challenges), not password transmission M3. Password/biometric entry only locally unlocks the key—the service only sees the cryptographic signature