![]() ![]() "We can recover speech from lightweight, shiny objects placed in proximity to an individual who is speaking by analyzing the light reflected from them," says Ben Nassi, the Ben Gurion professor who carried out the research along with Ras Swissa, Boris Zadov, and Yuval Elovici. Unlike older experiments that similarly watched for minute vibrations to remotely listen in on a target, this new technique let researchers pick up lower-volume conversations, works with a far greater range of objects, and enables real-time snooping rather than after-the-fact reconstruction of a room's audio. By pointing an optical sensor attached to a telescope at one of those shiny objects-the researchers tested their technique with everything from an aluminum trash can to a metallic Rubik's cube-they could detect visible vibrations on an object's surface that allowed them to derive sounds and thus listen to speech inside the room. 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.Īt the Black Hat Asia hacker conference in Singapore this May, researchers from Israel's Ben Gurion University of the Negev plan to present a new surveillance technique designed to allow anyone with off-the-shelf equipment to eavesdrop on conversations if they can merely find a line of sight through a window to any of a wide variety of reflective objects in a given room. Consider even stripping internal microphones from your devices. ![]() Put your phone in a Faraday bag-or a fridge. The most paranoid among us already know the checklist to avoid modern audio eavesdropping: Sweep your home or office for bugs.
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