[Cryptography] "The Visual Microphone: Passive Recovery of Sound from Video"

[Jerry Leichter]

Everything leaks.  Film a bag of chips through a soundproof window, decode its vibrations to listen to what's being said in the room.

https://www.youtube.com/watch?v=FKXOucXB4a8

I'll bet you could go a pretty good job of decoding keyclicks from a "secure" room this way.

(From Lauren Weinstein's Privacy list).
                                                        -- Jerry

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