Malware can exfiltrate data from air-gapped computers by modulating keyboard LED lights at rates up to 3000 bits per second with light sensors or over 120 bits per second with smartphone cameras.
Image sensor based visible light com- munication,
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CTRL-ALT-LED: Leaking Data from Air-Gapped Computers via Keyboard LEDs
Malware can exfiltrate data from air-gapped computers by modulating keyboard LED lights at rates up to 3000 bits per second with light sensors or over 120 bits per second with smartphone cameras.