I am aware of one paper (although I forget the name) in which an AES key is extracted from several meters away as a result of coil whine (potentially audible vibration of an inductor coil), but I can't find any research which looks into acoustic side-channel attacks that may not be possible when a device is first manufactured but can become feasible later on in the device's life as parts wear down, filtering capacitors fail open, and inductor coils come loose. Is there any research into the progression of susceptibility of modern computers to acoustic side-channel attacks as they age?
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