a2800276 writes: "The NSA has released some documents about Tempest in response to a FOIA request. They can be found over at Cryptome. Some are really old (dating between '75 and '95) and heavily redacted but interesting nontheless."
I tell them to turn to the study of mathematics, for it is only there that
they might escape the lusts of the flesh.
-- Thomas Mann, "The Magic Mountain"