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Android Compatibility Update for Cryptnox FIDO2 Card and Security Keys

FIDO2 vs U2F Security Keys via NFC on Android

Cryptnox FIDO2 Cards are powerful Security Keys designed for strong two-factor authentication. However, their compatibility with Android devices can vary depending on system updates and support for NFC-based security protocols. In this update, we explain the current status of FIDO2 card functionality on Android, highlight any limitations, and provide important information for users looking to secure their mobile access with a Security Key.

U2F (Universal 2nd Factor) and FIDO2 are open security standards for strong, phishing-resistant authentication using physical security keys (like a YubiKey).

  • U2F is the older standard, used only as a second factor (after entering a password)

  • FIDO2 is the newer standard that enables both second factor and passwordless logins, using what’s called a resident key (stored on the device).

    Both are supported by major platforms like Google, Microsoft, and Apple — but with varying levels of support depending on the device, browser, and method of connection (USB, NFC, Bluetooth).

The Corrected Key Facts about NFC security keys on Android

  • Android supports both U2F and FIDO2 over NFC, but with limitations depending on the key type and the browser or app in use.

  • U2F via NFC works reliably as a second factor, e.g., when logging into your Google account, if the security key was registered via Android.
  • FIDO2 over NFC support in Chrome on Android is limited  — especially for resident keys (passwordless login).

  • Security keys used via NFC are typically only used as a second factor on Android (you still need to enter a password).

  • To enable passwordless login or resident key support with the same physical key, it’s recommended to register the key on a desktop (e.g., Windows, macOS), but without guarantee that it will work even as 2FA only via Android.

  • You can register the same key twice — once on Android (for 2FA via NFC) and once on a desktop (for FIDO2/resident keys).
Conclusion:due to the multiple possible configurations (mobile phone, Android version, browser, website), its is required to perfom a test registration and authentification to confirm the compatibility.

Compatibility Table: External Security Keys via NFC

Updated 26th of April 2025.

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