基于部分空间耦合扰乱编码的数据链信息安全技术  

Partially Spatially Coupled Scrambling Coded Scheme for Data Link Information Security

作　　者：杜俊逸 肖磊 周志恒[2] DU Jun-yi;XIAO Lei;ZHOU Zhi-heng(CETC Key Laboratory of Avionic Information System Technology,Chengdu,610036;Natinalal Key laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu,611731)

机构地区：[1]中国电子科技集团公司航空电子信息系统技术重点实验室,成都610036 [2]电子科技大学通信抗干扰国家级重点实验室,成都611731

出　　处：《电子科技大学学报》2021年第3期332-338,共7页Journal of University of Electronic Science and Technology of China

基　　金：中央军委科技委基础加强重点项目(2017-JCJQ-ZD-015)。

摘　　要：为抵抗高对抗环境下蓝方对红方数据链信息的窃听,该文提出了一种基于部分空间耦合扰乱编码的信息安全技术。不同于传统基于加密算法的顶层保密技术,该文借助高斯窃听模型,通过设计物理层编码调制技术来提供信息安全保障。在发送端,该文将相邻码字的部分消息比特序列进行空间耦合,使得码字间存在相关性。在接收端,该文引入反馈迭代解调译码机制,使译码错误可以在码字间传播,以达到恶化蓝方窃听性能的目的。该文分别从信息论和安全界的角度论证了所提技术的优势。相比于目前性能最好的扰乱矩阵技术,该文所提技术不仅从理论上可以取得更低的窃听信道互信息和更高的疑义度,在有限长性能仿真中也可以达到更低的安全界。In this paper,a partially coupled scrambling coded scheme is proposed for data link to prevent eavesdropping of classified messages in the antagonistic environment.Different from the classical security technique designed in the upper layer,e.g.cipher,the proposed technique in this paper aims to design a practical coded modulation scheme to ensure security in the physical layer.At the transmitter,the codewords are partially spatially coupled so as to introduce correlations between codewords.At the receiver,an iterative demodulation and decoding scheme is proposed to propagate decoding errors,which worsens the decoding performance of the eavesdropper.The proposed technique has a great information security performance,verified by both theoretical proof and practical simulations.Compared to the well-known scrambling scheme,the proposed spatially coupled scrambling coded scheme has a lower mutual information value and a higher equivocation rate,as well as a lower security gap in a finite-length simulation.

关 键 词：耦合编码 疑义度 高斯窃听信道 信息安全 

分 类 号：TN918.91[电子电信—通信与信息系统]