Better WiFi security could soon be just a few rolls of wallpaper away. French researchers at Institut Polytechnique de Grenoble, in cooperation with the Centre Technique du Papier, have developed a wallpaper that can block WiFi signals, preventing them from being broadcast beyond the confines of an office or apartment. But unlike other signal-blocking technologies based on the Faraday cage (which block all electromagnetic radiation), the wallpaper only blocks a select set of frequencies used by wireless LANs, and allows cellular phones and other radio waves through. L’Informatcien reports that researchers claim the price of the wallpaper, which is being licensed to a Finnish manufacturer for production, would be “equivalent to a traditional mid-range wallpaper.” It should be available for sale in 2013.