Native Security Scheme Based on Physical Layer Chain Key for Encryption and Authentication

To solve the problem that key is susceptible to eavesdroppers in the correlated channel scenarios, in this paper, we propose a native security scheme based on physical layer chain keys, which can be used for encryption and authentication. First, the physical layer chain key is generated by performing XOR operation on the updated key and the previous chain key, where the updated key is obtained by the current channel state information. The proposed scheme uses the chain key as the authentication root, and the authentication relationship is continuously transferred as the chain grows. Then, CRC is used to realize identity authentication and message verification simultaneously. Finally, the derivation based on information theory proves the security of chain key for encryption and authentication. The simulation results show that the proposed chain key scheme can leak less information and have a lower probability of successful attack than the traditional physical layer key in the correlated channel scenarios.