Packet Encoding Based on Encrypted Raptor Code for Secure Internet of Vehicles Communication.

The Internet of Vehicles (IoV) industry has developed rapidly in recent years. However, the information security of IoV needs more attention. The use of cross-layer secure transmission technology can improve the security of IoV communication, but the existing cross-layer schemes have some shortcomings. To this end, we propose a packet encoding scheme based on encrypted Raptor codes to improve the secure capacity of IoV communication by utilizing fountain codes and physical layer Low-density parity-check (LDPC) codes. Specifically, we choose Raptor codes which combine LDPC codes and fountain codes for secure encoding. With a sparser degree distribution, Raptor codes make decoding faster and more accurate at the legitimate receiver. In the transmission, the transmitter encrypts and sends the coding control information corresponding to the packets received by the legitimate receiver, rather than sending the generating matrix directly. We found that confidentiality can be improved by this encrypting. The simulation results show that the proposed scheme has higher security than the comparison schemes.