A Physical-Layer Message Encryption and Authentication Scheme

Most of physical-layer authentication schemes cannot prevent passive eavesdropping. In this paper, we propose a message encryption and authentication scheme based on physical-layer characteristics of wireless channel. By extracting the channel characteristics, the physical-layer key is generated. Then a key stream generator generates the key stream to protect the privacy of the transmitted data through the seed generated by a physical-layer key and an identity key. Finally, receiver authenticated the authenticity and integrity of the received message through a CRC check. Simulation results show that this scheme has a better performance in preventing both passive eavesdropping and active attack, thus the randomness of key stream is greatly improved and the rate of authentication missed detection rate is reduced by half.