Abstract: Embodiments of a data transmission network device and methods of operating the same are disclosed. In one embodiment, the data transmission network device includes an encryption module and an RF transceiver. The encryption module is configured to receive data and encrypt the data so as to generate first encrypted data. The encryption module then encrypts the first encrypted data so as to generate second encrypted data. The RF transceiver is configured to generate an RF signal such that the second encrypted data is modulated onto the RF signal. By providing the double encryption in a single device, the data transmission network device has greater spectral efficiency and is a much more cost-effective solution than what is currently provided in the market. Furthermore, the encryption module can be disabled so that unsecure data can also be transmitted via the data transmission network device.