Side-channel impacts of coil whine and related acoustical phenomena over time

I am aware of one paper (although I forget the name) in which an AES key is extracted from some 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 acous… Continue reading Side-channel impacts of coil whine and related acoustical phenomena over time

How sensitive are acoustic side-channels to compression with a narrowband codec?

Assume sensitive audio emissions from a mechanical keyboard. These audio emissions are often sufficient to reconstruct the actual key presses that generated the sound. If the audio is compressed using a narrowband audio codec such as G.711… Continue reading How sensitive are acoustic side-channels to compression with a narrowband codec?