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FwKnop-ng

Port knocking client for FwKnop (Single Packet Authorization)
FwKnop-ng is an Android client for fwknop (Single Packet Authorization). It sends an encrypted, authenticated SPA packet that makes a fwknopd server open a firewall port for your IP address.

Features


  • Rijndael (AES) and GPG (via OpenKeychain) encryption, HMAC authentication

  • Configurations stored encrypted (Android Keystore, Tink, SQLCipher)

  • Optional app lock (biometrics or device credential)

  • Encrypted backup and restore of all configurations

  • Import/export of configurations through QR codes

  • NFC tag triggered knocks



Note: configurations are bound to the device's Android Keystore. Removing the screen lock or a factory reset makes them unrecoverable: keep your fwknop keys elsewhere, or use the encrypted backup.
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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 2.1.2 (40) suggested Added on Oct 25, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 8.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • access location in the background
      This app can access location at any time, even while the app is not in use.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • android.permission.ACCESS_LOCAL_NETWORK
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • view Wi-Fi connections
      Allows the app to view information about Wi-Fi networking, such as whether Wi-Fi is enabled and name of connected Wi-Fi devices.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • control Near Field Communication
      Allows the app to communicate with Near Field Communication (NFC) tags, cards, and readers.
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • fr.gildasledrogoff.fwknop.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

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