Autonomous cars naturally rely on a variety of sensors in order to determine and navigate through its environment. Apparently, one of the most expensive sensors available can be foiled a a cheap, makeshift setup. Software security researcher Jonathan Petit demonstrated how a laser radar or lidar, specifically one from the IBEO Lux, could be tricked into seeing phantom cars, pedestrians, or walls, which could effectively paralyze the self-driving vehicle from moving or at the very least prevent it from being able to accurately analyze its surroundings.
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https://www.slashgear.com/self-driving-car-lidars-can-be-spoofed-by-60-gadget-07402237/