Security cameras are supposed to keep us safe, but what if they are also vulnerable to spying? A new technique developed by researchers at Northeastern University can capture the video feed from most modern cameras, even through walls.

The technique, called EM Eye, uses a radio antenna to pick up the electromagnetic radiation emitted by the wires inside the cameras. These wires act as unintentional radio transmitters, leaking the bits and bytes of the video data. By decoding this signal, the researchers can reproduce the real-time video, without any sound.

The technique works on a variety of cameras, from home security cameras and dash cams to smartphone cameras. The researchers tested it on 12 different kinds of cameras and found that the distance required to eavesdrop varied from less than 1 foot to 16 feet, depending on the camera model.

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