Authnkey

Passkey credential provider for hardware security keys

New in version 1.2.3

- Show supported user verification methods in device info dialog
- Handle keys where PIN does not grant passkey creation and authentication permissions
- Update privileged apps list, adding iodé Browser among others

New translations:
- Danish by Peder Thorsø

Authnkey is a credential provider that lets you use FIDO2 security keys (like YubiKey, SoloKey, Nitrokey, or Token2) for passkey authentication on Android.

Android's built-in WebAuthn support has a significant gap: it does not support CTAP2 over NFC. This means you cannot use PIN-protected passkeys or discoverable credentials with NFC security keys — you're limited to basic U2F tap-to-authenticate. Authnkey fills this gap by implementing the full CTAP2 protocol.

The app registers as a credential provider, so any app or browser that supports the Android Credential Manager API will offer Authnkey as an option when passkeys are requested.

This also works on devices without Google Play Services, since Authnkey implements the CTAP2 protocol directly rather than relying on Google's FIDO2 API.

Supported features:
- Passkey creation and authentication
- PIN verification
- Discoverable credentials
- Multiple accounts per site
- NFC and USB transports

No root required.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid

Version 1.2.3 (10) suggested Added on Apr 14, 2026

This version requires Android 14 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- control Near Field Communication
  
  Allows the app to communicate with Near Field Communication (NFC) tags, cards, and readers.
- use biometric hardware
  
  Allows the app to use biometric hardware for authentication
- use fingerprint hardware
  
  Allows the app to use fingerprint hardware for authentication
- pl.lebihan.authnkey.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 2.4 MiB PGP Signature | Build Log

New in version 1.2.2

- Add support for on-device user verification on CTAP 2.0 security keys
- Prevent some USB security keys from suppressing the on-screen keyboard

Version 1.2.2 (9) - Added on Mar 29, 2026

This version requires Android 14 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- control Near Field Communication
  
  Allows the app to communicate with Near Field Communication (NFC) tags, cards, and readers.
- use biometric hardware
  
  Allows the app to use biometric hardware for authentication
- use fingerprint hardware
  
  Allows the app to use fingerprint hardware for authentication
- pl.lebihan.authnkey.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 2.8 MiB PGP Signature | Build Log

New in version 1.2.1

- Allow text input in PIN fields regardless of keyboard type
- Fix authentication failure on some FIDO2 cards due to incorrect CBOR key order
- Show error for PIN exceeding max length on set and change

New translations:
- Galician by josé m.

Version 1.2.1 (8) - Added on Mar 23, 2026

This version requires Android 14 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- control Near Field Communication
  
  Allows the app to communicate with Near Field Communication (NFC) tags, cards, and readers.
- use biometric hardware
  
  Allows the app to use biometric hardware for authentication
- use fingerprint hardware
  
  Allows the app to use fingerprint hardware for authentication
- pl.lebihan.authnkey.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 2.8 MiB PGP Signature | Build Log

Versions

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