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现有基于无线信道特征的物理层安全方法通过检测发送方的导频信号实现身份认证,易出现漏检.本文提出基于等效信道的物理层认证及密钥分发机制,利用多个时隙的信道特征对任意密钥进行加密传输建立等效信道,将信道特征的差异映射为传输畸变.依据密钥传输的正确性判断收发两端信道特征互信息的大小,从而在完成密钥的分发的同时实现发端身份认证.分析及仿真说明该机制密钥分发性能与现有方法相当,同时可以在不同空域信道相关性很强的情况下识别出窃听者的攻击.
The existing physical layer security method based on the characteristics of wireless channel realizes identity authentication by detecting the pilot signal of the sender and is prone to missed detection.This paper proposes a physical layer authentication and key distribution mechanism based on equivalent channel, Channel characteristics of any key to encrypt the transmission of the establishment of equivalent channels, the channel characteristics of the difference mapping for transmission distortion.According to the correctness of the key transmission to determine the size of the receiving and sending channel characteristics of mutual information, so as to complete the key distribution At the same time, the originating authentication is realized.Analyzing and simulating the performance of the proposed mechanism shows that the key distribution performance of this mechanism is comparable to that of the existing methods and the eavesdropper’s attack can be identified under the condition that the correlation of different airspace channels is very strong.