本项目以提高无线通信系统信息传输的安全性为目的，利用无线信道的衰落、噪声以及广播等特性，研究基于协作的物理层安全机制及信息理论。本项目的研究内容包括：（1）分析不同的信道衰落对无线通信系统的安全性能与安全容量的影响，并以此为基础研究基于协作技术的物理层安全机制；（2）研究公共信道中基于协作的密钥分发技术，引入物理层网络编码以提高密钥的信息熵。通过本项目的研究，我们将解决无线物理层安全中的一些关键问题，进一步完善基于信息论的安全理论体系，为物理层安全机制的实际应用打下坚实的理论基础。

The goal of this project is to improve the security of the information transmission for wireless communication systems. By exploiting the fading, noise and the broadcast natures of the wireless channel, the information theory and techniques of the physical-layer security via cooperation will be studied. The research of the project includes: (1) Analyze the impact of the different channel fading on the security capacity and performance of wireless communications, and based on the analysis results, study the enhanced physical-layer security techniques via cooperation; (2) Study the distribution techniques of the cryptography key in common channel via cooperation, and utilize the physical-layer network coding to improve the information entropy of the cryptography key. With the study of this project, the key problems of the physical-layer security will be solved; the theory of information-theory security will be further improved; and a solid theoretical foundation for the application of the physical-layer security techniques will be built.