More thoughts on acoustic cryptanalysis

Now that I think about it, if my theory is correct then this applies to EVERYTHING powered by a switch-mode power supply. In today’s world, that means just about everything running off wall power, and most things running off battery power.

Cameras, air-gapped routers, external hard drives, pacemakers, specialized crypto gear, nuclear missiles…

The logical defense would be a white- or pink-noise source from a transducer capable of reproducing well up into the ultrasound range. Not unlike stuff I’ve already talked about here — a neon bulb would do for a low-volume signal, a plasma tweeter (TL494 + MOSFET + flyback?) probably for higher volume stuff…

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