[NJ_gent]

"Even better, some people recently figured out how to tell what you're typing by the sound the keyboard makes. They only need to know who manufactured your keyboard and point a sound-detecting laser at your window."

TEMPEST's work goes past such limitations. You can reconstruct the image on a monitor by studying the interference pattern it generates. Thus, the words on your screen are reconstructed as you type them regardless of your keyboard and without using a laser which may constitute a nasty 'intrusion of privacy' in a court of law. NSA's been briefing corporations on how to protect and shield themselves from this sort of thing for quite a while. How long before the actual detection technology is shared with the FBI and local law enforcement who can begin using it at will?

[antiRepublicrat]

TEMPEST's work goes past such limitations.

I know, I've worked with TEMPEST-resistant systems. But this can be done relatively cheap, and without having to get a security clearance to work with TEMPEST.