Researchers at the University of Tokyo have created paint larded with aluminum-iron oxide, which block electromagnetic waves.
This is nothing new though, as RF-blocking paints have been available for a number of years now. Indeed, EM-SEC Technologies successfully tested its own RF-blocking paint back in March 2007 to shield wireless devices and other electronic equipment within a building. But what the New Scientist is reporting is that existing technologies are becoming increasingly obsolete as companies are now using new, higher frequencies to send data. For example, the best wave absorbers commercially available today are only effective up to around 50GHz.It'll be cheap, according to the scientists, as they collaborating with a real paint company to make the stuff in the first place: about $14 a kilo. Block Wi-Fi Intruders with a Secure Paint Job [PC World]