隐藏有限字符特性的跳空安全传输方法  

A Space Hopping Secure Transmission Method with Masked Characteristic of Finite Alphabets

作　　者：崔波[1] 刘璐[1] 李翔宇[1] 金梁[1] 

机构地区：[1]国家数字交换系统工程技术研究中心,河南郑州450002

出　　处：《电子学报》2015年第5期940-947,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61171108)

摘　　要：针对无线数字通信系统,从信息论角度推导了一个保障物理层安全传输的充分条件,并提出了一种隐藏有限字符特性的跳空安全传输方法.首先,在有限字符输入系统中,多天线窃听者具有离散有噪无损信道(Discrete Noisy Lossless Channel,DNLC)结构,可以恢复保密信号,致使人工噪声方法失效,因此破坏窃听者的DNLC结构是保证系统传输安全的一个充分条件.然后,利用无线信道特征的多样性和独特性,提出一种基于多输入多输出(Multiple Input Multiple Output,MIMO)系统的跳空安全传输方法,在传输信息的过程中随机切换收发天线并发送空域干扰,可以隐藏保密信号的有限字符特性并破坏窃听者的DNLC结构.最后,理论分析和仿真结果表明了该安全方法的有效性.Addressing the wireless digital communication system, a sufficient condition to ensure the physical-layer security transmission is derived from the viewpoint of information theory, and a space hopping secure transmission method is proposed, which can mask the characteristic of finite alphabets. First, since the multi-antenna eavesdropper in the finite-alphabet-input system possess- es the architecture of Discrete Noisy Lossless Channel （DNLC）, it can reconstruct the secret signal and invalidate the artificial noise method.As a result, destroying the eavesdropper＇s DNLC architecture becomes a sufficient condition for ensuring the security of system transmission. Then, utilizing the diversity and uniqueness of wireless channel characteristics, a space hopping secure transmis- sion method based on the Multiple Input Multiple Output （MIMO） system is proposed. It switches receiver/transmitter antennas and transmits spatial scrambling during the information transmission, which can mask the finite alphabet characteristic of the secret signal and destroy the eavesdropper＇ s DNLC architecture. Finally, theoretical analysis and simulation results demonstrate the efficacy of the secure method.

关 键 词：无线物理层安全 有限字符 跳空 离散有噪无损信道 多输入多输出多天线窃听者 

分 类 号：TN92[电子电信—通信与信息系统]