一种低采样率下VGA线缆辐射信息恢复方法  

A recovery method of VGA cable radiation information at low sampling rate

作　　者：杨旺霖 苏新彦[1] 姚金杰[1] 石森[2] 马欣瑜 Yang Wanglin;Su Xinyan;Yao Jinjie;Shi Sen;Ma Xinyu(State Key Laboratory of Electronic Testing and Proceeding Technology,North University of China,Taiyuan 030051,China;Information Industry Information Record and Anti Leakage Product Quality Supervision and Inspection Center,China Electronic Technology Group Corporation,Taiyuan 030032,China)

机构地区：[1]中北大学信息探测与处理技术重点实验室,太原030051 [2]中国电子科技集团公司信息产业信息记录及防泄漏产品质量监督检验中心,太原030032

出　　处：《电子测量技术》2021年第10期103-108,共6页Electronic Measurement Technology

摘　　要：在计算机系统电磁辐射的信息泄漏中,视频信号是最容易被截获及恢复的信息。针对计算机系统VGA线缆传导发射的视频信号的恢复问题,建立了计算机模拟视频信号在VGA传输通道中的传输及电磁辐射模型,分析了模拟视频信号的呈像规则以及采集过程中模拟视频信号在各个阶段的时域特性,得到了VGA线缆辐射的模拟视频信号的恢复步骤。由于低采样率下恢复的单帧视频信号质量差,故根据视频信号的呈像规则将连续多帧恢复图像重叠,即可在低采样率下得到质量较高的恢复图像。仿真结果表明,该方法可有效增加视频图像的恢复质量,在低采样率下恢复质量的提升尤为明显。为验证仿真结果的正确性,对实际截获的VGA线缆辐射信息进行还原,所得结果与仿真基本符合。In the electromagnetic radiation information leakage of computer system, video signal can be intercepted and recovered easily. Aiming at the problem of video signal recovery of VGA cable radiation in computer system. The transmission and electromagnetic radiation model of computer analog video signal in VGA transmission channel are established. The imaging rules of analog video signal and the time domain characteristics of analog video signal in each stage during transmission are analyzed. The recovery steps of analog video signal radiated by VGA cable are obtained. Due to the poor quality of the quality of single frame video signal recovered at low sampling rate, according to the image presentation rules of video signal, multiple consecutive recovered images are overlapped, and the recovered image with high quality can be obtained at low sampling rate. Simulation results show that this method can effectively improve the quality of video image restoration, especially at low sampling rate. In order to verify the correctness of the simulation results, the actual intercepted VGA cable radiation information is restored, and the results are in accordance with the simulation.

关 键 词：视频信息 信号处理 TEMPEST 电磁辐射 信息安全 

分 类 号：TP309.1[自动化与计算机技术—计算机系统结构]