Japanese researchers have come up with a paint that they say will block high-speed wireless signals, giving businesses a cheap option to protect their wireless networks. 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. Due to the relatively cheap materials used in the paint the paint is expected to be cheap to manufacture. The simple application of cheap paint is expected to be a welcome addition to workplaces and secure facilities around the world where previous methods of securing wireless networks involved complex and expensive electronics or shielding.

Other methods include putting energy-efficient windows in buildings, physically blocking radio signals or even turning a building or office into a 'Faraday Cage' using mesh metal. However these options tend to be expensive.

Via [Crunch Gear]