http://en.wikipedia.org/wiki/TEMPEST
TEMPEST is a codename referring to investigations and studies of compromising emanations (CE). Compromising emanations are defined as unintentional intelligence-bearing signals which, if intercepted and analyzed, may disclose the information transmitted, received, handled, or otherwise processed by any information-processing equipment.
Eckbox is software designed to aid in a specific type of security testing against a spying attack known as van Eck Phreaking or TEMPEST. It involves picking up radiation leaking from an electronic device, such as a monitor, and interpreting the signal to recreate the data contained in the device. This can be thought of as a sort of shoulder-surfing. Eckbox is the first and only open-source software designed that helps to test against this kind of attack. But it's still in early development, so feel free to contribute code, ideas, designs, advice, and nonthreatening e-mails :).
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