Some mad scientists in Japan have made a WiFi resistant paint. A group of researchers at the University of Tokyo blended regular house paint with Aluminum Iron Oxide to create a paint that is capable of blocking stray Wifi signals.
What this means is that for the price of a couple of gallons of paint you can add an extra measure of security to your home or office wireless network.
Of course you will still get leakage from windows and other places that you would not normally paint but it should be able to greatly reduce the amount of signal that wardrivers and other WiFi thieves can use to piggyback on your signal.
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