Tokyo paint : Protect your Wi-Fi from neighbors and hackers !
Are you anxious of your neighbors rudely snooping on the wireless signal? It’s not just about slowing down your internet speed; while they are downloading huge files, games, for movies. You could be on the hook for their unlawful actions.
Wireless security and encryption systems are loaded with problems and insecurity, and other methods to restrict your signal to a small area are cumbersome at best.
Researchers say they have created a special kind of paint which can block out wireless signals. It means security-conscious wireless users could block their neighbors from being able to access their home network – without having to set up encryption.
The paint contains an aluminum-iron oxide which vibrates at the same frequency as wi-fi – or other radio waves – meaning the airborne data is absorbed and blocked. By coating an entire room, signals can’t get in and, crucially, can’t get out. This paint is developed at the University of Tokyo. And this special paint could cost as little as £10 per kilogram only.
Therefore you can use this special paint on your walls where you don’t want wireless to pass through (lets say the exterior of your house). The secret is mixing aluminum-iron oxide particles in with the paint. The metal particles resonate at the same frequency as Wi-Fi and other radio waves, so signals can’t pass through the thin layer of pigment.
Outsiders would simply be unable to access your wireless network, just as you, inside the house, won’t be able to interlope on anything beamed on the outside. This paint is said to be the first that can block radio frequency in higher spectra where Wi-Fi and other higher-bandwidth communications occur rather than just low-frequency wireless like FM radio.
Most Wi-Fi technologies operate at 2.4GHz; the Tokyo paint can reportedly block frequencies all the way up to 100GHz, with a 200GHz-blocking paint now in the works. The paint isn’t just of interest to those concerned about wireless leaking out of the building. Movie theaters have long been interested in finding a legal way to keep cell phones silent during screenings.
Electronic jammers that actively block wireless signals are illegal, but passive materials that prevent wireless signals from getting through are not. Since the wireless-blocking paint can also block the lower-frequency signals that cell phones use, addled mobile junkies would have no outlet for reaching the outside world.
You could block phone signals from outside and stop people’s phones ringing during the movie. ”
Shin-ichi Ohkoshi, University of Tokyo.