Heat, Fans, and the Limits of Air-Gapped Security
A viral clip claims two air-gapped machines can talk through CPU heat, and technically that's true — BitWhisper demonstrated it in 2015. But at one to eight bits per hour and a range of forty centimeters, the demo barely moves a toy missile launcher. So why does the air-gap exfiltration literature keep growing? We walk through Dr. Mordechai Guri's Offensive Cyber Research Lab at Ben-Gurion University, the fan-speed channel (Fansmitter, AiR-ViBeR, SpiralSpy), magnetic fields that punch through Faraday cages (MAGNETO), hard-drive LEDs blinking at 5,800 times per second, and a video cable…
The skinny
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