近年来通信安全问题越来越受到人们的关注,当前协作网络安全技术大多数是来源于有线通信网络中的密钥加密技术。这种安全性的高低与算法的技术方法和复杂程度有关。以现代信息论的角度去讨论物理层关键技术的研究动态已经成为了当下的热点。本文针对协作网络中物理层存在的安全问题进行了相关的分析,并对这些问题采用的关键技术进行了系统的探究。 In recent years, the problem of communication security has drawn more and more attention. At present, most of the cooperative network security technologies are derived from the key encryption technology in wired communication networks. The level of security depends on the technical approach and complexity of the algorithm. It has become the current hot spot to discuss the research trends of the key technologies in the physical layer from the perspective of modern information theory. This paper analyzes the security problems in the physical layer of cooperative network and analyzes the key technologies of these problems systematically.