Thursday, October 15, 2009

Paint Your "See-Through" Walls?

Researchers (University of Tokyo) say they have created a special kind of paint which can block out wireless signals. It means security-conscious wireless users could block their neighbours from being able to access their home network - without having to set up encryption.

The paint contains an aluminium-iron oxide which resonates 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...

Some security experts remain unconvinced by the paint. "The use of electromagnetic shielding techniques are nothing new," said Mark Jackson, security engineer at Cisco UK. (more)

Mark is correct. This is nothing new. Furthermore, the "blocking" claims are bogus. Radio waves may be attenuated, but they are not blocked. Windows and cracks around doors allow radio waves to pass freely. We've reported on this before. (more)