stealth tempest wallpaper

[Bill Stewart]

What's interesting about the wallpaper is the ability to
block some frequency bands while passing others.
There's been good shielding wallpaper available for ~15 years,
but that's for blocking everything including cellphones and pagers.

At 12:20 PM 8/9/2004, Sunder wrote:
>http://www.newscientist.com/news/print.jsp?id=ns99996240
>or http://www.newscientist.com/news/news.jsp?id=ns99996240&lpos=home3
>
>Stealth wallpaper keeps company secrets safe
>10:00 08 August 04
>Special Report from New Scientist Print Edition. Subscribe and get 4 free 
>issues.
>
>A type of wallpaper that prevents Wi-Fi signals escaping from a building
>without blocking mobile phone signals has been developed by a British
>defence contractor. The technology is designed to stop outsiders gaining
>access to a secure network by using Wi-Fi networks casually set up by
>workers at the office.