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 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