Chicago (IL) - EM-SEC Technologies, a company better known for its governmental and military technologies, has released a commercial paint which the company says, with validation from the National Security Agency (NSA), will block Wi-Fi signals.
The paint will block signals coming in or going out of a room, but will allow them to freely operate within the space. For example one could paint a boardroom or Research and Development lab with the stuff.
The problem, of course, is that one would need to seal any windows and mobile phones probably wouldn’t work in the protected room either. A better solution might be to simply turn the encryption on.