计算机声光电磁信号互调泄漏威胁分析

Threat Analysis of Computer Information Leakage in Intermodulation of Acoustic, Optical and Electromagnetic Signals

典型的信号互调泄漏威胁是利用无线高频率信号对目标设备低频信号的调制,可以跨越物理隔离,使难以泄漏的信号变得容易泄漏,如保密领域常提到的涉密场所引发二次发射泄漏的无线发射设备和斯诺登曝光的NSA窃密装置CTX4000。具体地,通过捕捉计算机设备及其周边环境声、光、电磁信号的无意互调信号,分析利用互调原理无意或恶意产生的信息泄漏隐患,提炼出计算机等电子设备信号互调信息泄漏特征,并提出相对应的威胁防控方法。

Typical signal intermodulation leakage threats are the modulation of low-frequency signals of target devices by radio high-frequency signals, which can break the air-gap network and make it easier to leak information, such as the wireless transmitting equipment that causes secondary leakage in secretrelated places, and the NSA stealing device CTX4000 exposed by Snowden. By capturing the unintentional intermodulation signals of the acoustic, optical and electromagnetic signals of computers and their surrounding environment, the potential information leakage hazards caused by unintentional or malicious intermodulation principle are analyzed, the characteristics of information leakage of intermodulation signals of equipment such as computers extracted, and the corresponding threat prevention and control methods proposed.