基于信道加密的物理层安全理论与方法研究

项目名称： 基于信道加密的物理层安全理论与方法研究

项目编号： No.61502518

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 李为

作者单位： 中国人民解放军国防科技大学

项目金额： 20万元

中文摘要： 物理层安全技术是实现抗侦测和低截获的有效手段，对于提高个人通信的私密性和军事通信的安全性具有重要意义。物理层安全技术利用无线信道的衰落性、差异性、互易性等特性来保障信息传输的安全性，成为目前的研究热点。然而在实际中由于信道的衰落特性和不确定性，现有基于保密容量的物理层安全理论是基于概率意义的安全，难以达到绝对安全的效果。本项目将探索新思路：利用无线信道提取密钥，然后用密钥在信号编码调制层次进行复数域加密，达到安全目的。无线信道提供了天然的随机源，是密钥提取的途径。信道加密也利用了无线信道的有噪性和随机性，相比传统密码学多了一层保护因素。项目将信道衰落对通信可靠性的不利影响利用来提升系统的安全性。项目还将探索复数域信号的加密方法，并研究其安全性评价指标。项目成果不仅对构建新一代无线通信物理层加密方案的具有实践意义，还对复数域加密理论研究领域发展起到促进作用，为揭示物理层安全本质规律提供支撑。

中文关键词： 物理层安全；密钥提取；复数加密；无线通信；多输入多输出

英文摘要： The technology of physical layer security is an effective way to achieve the goal of communication anti-reconnaissance and low probability of intercept. It is very important for improving the secrecy for both of personal and military communications. Physical layer security technology which guarantees the security of information transmitted by utilizing the characteristics of wireless channel such as fading, differences, and reciprocity, becomes a hot topic. Yet in practice due to channel fading characteristic and uncertainty, the existing physical layer of the secrecy capacity based on the theory of probability significance of safety is based on security, it is difficult to achieve the effect of absolute security. This project will explore a new method: to extract keys from the wireless channel, and then use the key to encrypt in the complex domain modulation signal to achieve security purposes. Radio channel provides random a natural source for key extraction. Channel encryption also also takes advantage of the wireless channel noise and randomness. This methodology is more secure compared to traditional.The project will be the channel fading adverse impacts on the reliability of communication utilized to improve security system. The encryption method of the project will also explore the complex domain signal, and to study its safety evaluation index. Results of the project will not only help to build a new physical layer encryption scheme for the next generation of wireless communications, but also play a catalytic role in the complex domain encryption theoretical research areas of development, to reveal the nature of the physical layer security.

英文关键词： physical layer security;key extraction;complex domain encryption;wireless communications;MIMO