The problem of securing wireless networks has been an issue for a while now. Wi-Fi LANs with no encryption or running the obsolete WEP system, run the risk of having hackers outside the building eavesdrop on wireless LAN traffic, or simply stealing bandwidth. However, there are a number of solutions, besides encryption, for companies wishing to secure their networks.
For example, Meru Networks said last year that it was using Wi-Fi signals to "cloak" wireless LANs and make it impossible for hackers to decipher them outside the office building. 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."
"But now, according to a report in the New Scientist, paint can be used to secure high-speed 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."