Authnkey
Passkey credential provider for hardware security keys
| AppID: | pl.lebihan.authnkey |
| Author: | Michel Le Bihan |
| License: | MIT |
| InRepoSince: | 2025-12-14 |
| LastRepoUpdate: | 2026-01-13 |
| LastAppUpdate: | Unknown |
| LastVersion: | 1.1.1 |
| Categories: | Password & 2FA, Security, System |
| Google Play: | Check if it's there |
Authnkey is a credential provider that lets you use FIDO2 security keys (like YubiKey or SoloKey) 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.
WhatsNew:
- Improve USB FIDO device detection and automatic transport switching
- Remove USB scan button (no longer needed with auto-detection)
- Add support for privileged callers providing their own clientDataHash
- Improve compatibility with CTAP 2.1 PRE authenticators
- Improve system bar insets handling in main activity
- Preserve class names in minified builds
While you can download the APKs here directly, you should preferably use an F-Droid client so the app stays up-to-date on your device.
