基于隐蔽声通道的物理隔离计算机信息泄漏研究

摘要

计算机一般内置有风扇、扬声器、蜂鸣器等转动、发声或告警模块,因此具有声学工作特征.物理隔离计算机可以通过声学泄漏来构建隐蔽通道,因为使用人耳听不到的声信号传输具有可靠性高、隐蔽性强、实现简单等特点.鉴于此,概述国内外隐蔽声通道的最新研究情况,分析典型通道的隐蔽性,验证基于扬声器的隐蔽通道构建,提出并实现了基于蜂鸣器的新型隐蔽泄漏通道,并探讨了隐蔽声通道的检测与防护措施.%Computers usually has the built-in fan, speaker, buzzer and other rotating, sounding and alarming modules. An air-gapped computer may establish covert channel, through acoustical leakage, and the transmission of acoustic signal that cannot be heard by the human ear is characterized by high reliability, strong concealment and simple realization. In view of this, the latest research on convert acoustical channel at home and abroad is summarized, the concealment of typical channels analyzed, and the construction of covert channels based on speakers verified. A new type of data exfiltration by buzzer is proposed and implemented, and the detection and protection of the covert acoustical channel also discussed.