BSA deploys imaginary pirate software detector vans

[Steve Schear]

At 07:12 PM 11/13/00 -0600, Neil Johnson wrote:
>The general idea is to pick up and decode the RF emissions generated by the
>CPU, Memory, I/O and Video systems to figure out what the computer is doing.
>
>It takes some work (not as much as you would think), but there have been
>documented demonstrations where the video signals from a PC were picked up
>and reproduced on another monitor several hundred feet away.
>
>TEMPEST is the "code" name for the U.S. Governments standards for shielding
>computer equipment used for classified work inorder to prevent such
>eavesdropping.
>
>The technique is often referred to as "Van Eck Phreaking" (sic).

As I recall one suggested method in the paper involved some cleaver 
manipulation of pixel intensities and/or location to create the equivalent 
of a high process gain spread spectrum signal.  Brilliant concept.

steve