基于分组密码的物理层加密通信系统  

Physical-layer encryption communication systems with block ciphers

作　　者：郭晶[1] 王剑[1] 袁坚[1] 山秀明[1] 任勇[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第11期1733-1737,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：传统安全通信系统分别设计信道编码、密码算法等模块,系统安全性几乎不受信道误码影响。借鉴物理层加密的概念,该文提出一种系统化设计方法,利用信道误码进一步提高系统安全性。提出对该系统进行安全性定量评估的方法,分别计算码字相关性和信道误码对安全性的影响,为研究该类系统提供了新的技术途径。理论和仿真结果表明:当二进制对称信道(BSC)的比特翻转概率大于阈值时,所设计的基于分组密码的物理层加密通信系统具有高于传统安全通信系统的安全性。Traditional secure communication systems separate the channel coding and cryptography so security is not affected by channel errors. This paper presents a design method based on physical-layer encryption to further improve system security by introducing channel errors into the cryptography. This paper also presents a method to quantitatively evaluate this system secrecy by calculating the impact of channel errors and correlations in codewords as a new technical evaluation method for similar systems. Theoretical and simulation results show that when the bit error rate for the binary systemetric channel （BSC） is larger than a threshold, the system in this paper is more secure than traditional systems.

关 键 词：物理层加密 信道误码 信道编码 线性密码分析 

分 类 号：TN918.91[电子电信—通信与信息系统]