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There have been many demos at security conferences of doing these kinds of things, "simple" things like key logging from a laptop with only a nearby radio.

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how about extracting pgp keys with a smart phone microphone from 6 feet away?

https://www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf

> Figure 4. A mobile phone (Samsung Note II) is placed 30 cm from a target laptop.

Less impressive than 6 feet, but still impressive.

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