Anything from a metallic Rubik’s cube to an aluminum trash can inside a room could give away your private conversations.
from your devices. Now one group of researchers offers a surprising addition to that list: Remove every lightweight, metallic object from the room that's visible from a window.
The researchers' trick takes advantage of the fact that sound waves from speech create changes in air pressure that can imperceptibly vibrate objects in a room. In their experimental setup, they attached a photodiode, a sensor that converts light into voltage, to a telescope; the longer-range its lenses and the more light they allow to hit the sensor, the better.
Nassi's team isn't the first to suggest that long-range, optical spying can pick up vocal conversations. In 2014, a team of MIT, Adobe, and Microsoft researchers created what they calledshowing it was possible to analyze a video of a houseplant's leaves or an empty potato chip bag inside a room to similarly detect vibrations and reconstruct sound.
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