Why is end-to-end encryption important for passkey sync?

End-to-end encryption (E2EE) is critical for securing passkey synchronization across devices. Without robust encryption, stored credentials could be intercepted, exposing user authentication data to attackers. By using E2EE, passkeys remain confidential, tamper-proof, and resistant to unauthorized access.

• Passkeys are encrypted before they leave the device – Only the user’s device can decrypt the passkey, preventing third-party access.
• No server-side decryption – Unlike traditional password managers, passkeys stored in Apple iCloud Keychain, Google Password Manager, or Microsoft Entra ID remain encrypted even on cloud servers.
• Biometric-based authentication – Only the rightful owner can unlock and use their passkey through Face ID, fingerprint, or device PIN.

• Prevents unauthorized access – Even if an attacker compromises cloud storage, they cannot decrypt passkeys.
• Ensures compliance with security standards – E2EE aligns with GDPR, NIST, FIDO2, and WebAuthn security best practices.
• Enhances phishing-resistant MFA – Protects against man-in-the-middle attacks and social engineering threats.

• Apple: iCloud Keychain ensures passkeys are E2EE-protected, preventing Apple from accessing stored credentials.
• Google: Passkeys synced via Google Password Manager use end-to-end encryption by default in Android 14 and Chrome.
• Microsoft: Microsoft Entra ID enables passkey storage, but cross-device sync lacks E2EE, making security enhancements necessary.

Enterprises adopting passkeys must prioritize end-to-end encryption to safeguard credentials, ensure data integrity, and protect users from identity theft. Secure authentication starts with strong encryption—make sure your passkeys are protected.