Information concerning a semi-mythical electromagnetic computer monitoring technology developed by the US government has been uncovered by Cypherpunks, an American technology activism group.

The technology, TEMPEST, supposedly allows computer activity to be monitored remotely according to electromagnetic radiation emanations. TEMPEST has long been rumoured although no concrete proof of it has ever been discovered.

Cypherpunks claims to have obtained information about TEMPEST from the US National Security Agency (NSA) through the freedom of information act and have published the information online .

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