FwKnop-ng

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.