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Paint Provides Network Protection
thefickler writes "Forget WEP and WPA; I'm switching over to the EM-SEC Coating System, a recently announced paint developed by EM-SEC Technologies that acts as an electromagnetic fortress, allowing a wireless network to be contained within painted walls without fear of someone tapping in or hacking wireless networks. The EM-SEC Coating System is clearly the most secure option aside from stringing out the CAT5, and can be safely used to protect wireless networks in business and government facilities."
Theoretically you would have a doubled doored vestibule... Most commercial buildings have one anyway to keep the (heat|air conditioning) bills low.
A physical barrier is not security through obscurity.
Is lead the only metal that
1) Can be made into a paint
2) Conducts radio waves (this is a Faraday Cage for radio waves)?
The answer is no. Most metals conduct radio waves to some degree, just like most can conduct all EM radiation. There are quite a number to choose from that are harmless to humans. Lead is the big choice because its so dense, but we're not talking about nuclear radiation here (and more importantly, we're not talking about nuclear particles, which are stopped by other matter getting in the way, not just by conductive materials). We're not blocking the EM equivalent of a truck - just a series of tubes.
I can see a way around the window/door thing as well.
Put enough conductive material into the Windows and you'll get the same effect. In addition, there are some shapes you can make the entryways (again using principals of a Faraday cage) that will cause the radio waves to tend not to reflect out.
Mod me down and I will become more powerful than you can possibly imagine!
Called "selective screens". Used everywhere here in Finland. They let heat in but not out. However, they are not of any use for blocking radio signals. (I guess they are also used in other parts of the world for the opposite effect)
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It's illegal to actively block frequencies (by using a jammer, for instance), but not illegal to passively block frequencies (by creating a Faraday cage, like this paint is trying to do).