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www.southgatearc.org
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Anti-wi-fi paint offers securityBBC News reports that researchers 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. Developed at the University of Tokyo, the paint could cost as little as £10 per kilogram, researchers say. Cost-effective security The makers say that for businesses it's a quick and cheap way of preventing access to sensitive data from unauthorised users. Presently, most companies have to invest in complicated encryption software to deter hackers. Speaking on the BBC World Service's Digital Planet programme, Shin-ichi Ohkoshi, who is leading the project, explained how the paint could have many uses beyond security. "In a medical setting, you could transmit large volumes of data from a medical device, such as an endoscope, to a computer. "By painting a solution containing our magnetic particles on the walls, you would quickly, and effectively, shield the room from stray electromagnetic radiation from outside."While paints blocking lower frequencies have been available for some time, Mr Ohkoshi's technology is the first to absorb frequencies transmitting at 100GHz (gigahertz). Signals carrying a larger amount of data - such as wireless internet - travel at a higher frequency than, for example, FM radio. "I'm working on a material that can absorb a larger range of frequencies. We are capable of making a paint that can absorb over 200 gigahertz." He hopes that soon the technology could be woven into clothing. "We're not sure about the true effects of electromagnetic waves, in this range, on the human body. "We're assuming that excessive exposure could be bad for us. Therefore we're trying to make protective clothes for young children or pregnant women to help protect their bodies from such waves." You can read the full BBC News story 'Anti-wi-fi paint offers security' at
Our thanks to Lee, M0HOK, for spotting thi item
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