Application of Key Exchange Algorithm under Private Random Precoding in Wireless Communication

Abstract This paper proposes a Physical Layer Network Coding (PLNC) scheme based on two channels pre-balanced by studying the PLNC technology and the security problem of the Network Coding (NC) system to solve the security problem of PLNC in Wireless Communication (WC). This security scheme focuses not only on the key generation process but also on the use of generated keys for encryption and decryption during the transmission of useful information by the NC system. In addition, for the security risks of the traditional Private Random Precoding (PRP) Key Exchange Algorithm (KEA), this paper proposes an improved PRP. The security and confidentiality of the KEA are strengthened. The method is applied to multi-user scenarios to verify. The results show that the security scheme based on channel time domain key generation encryption can ensure the security of the PLNC system and effectively prevent the eavesdropping attacks of illegal users. Compared with other algorithms, the improved PRP KEA significantly reduces the key error rate of generating a 64-bit key under the same conditions compared to the key when generating a 16-bit key, reaching less than 10-3. In scenarios with high correlation coefficients, the improved algorithm leaks less information than other algorithms and has higher security performance. Therefore, the improved KEA performs well for the physical layer network security problem in WC.