Communications of the ACM
Spies Can Eavesdrop by Watching a Light Bulb's Vibrations
Researchers at Israels Ben-Gurion University of the Negev and Weizmann Institute of Science have developed an eavesdropping method that exploits vibrations on the glass surface of a light bulb.
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Researchers at Israel’s Ben-Gurion University of the Negev and Weizmann Institute of Science have developed a long-distance eavesdropping method that exploits vibrations on the glass surface of a light bulb's interior.
The lamphone technique allows anyone with a laptop, a telescope, and an electro-optical sensor to pick up sound with sufficient clarity to discern conversations or even recognize a piece of music, by measuring small changes in light output from the bulb caused by sound vibrations.
Said Ben-Gurion’s Ben Nassi, "Any sound in the room can be recovered from the room with no requirement to hack anything and no device in the room. You just need line of sight to a hanging bulb, and this is it."
From Wired
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