Reflected Wi-Fi signals allow snoopers to read text through walls
Carefully measuring the Wi-Fi signals leaking out of a room can let you build up a detailed picture of what is inside – even to the extent of reading a sign made from 3D letters
Carefully measuring the Wi-Fi signals leaking out of a room can let you build up a detailed picture of what is inside – even to the extent of reading a sign made from 3D letters
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