TEMPEST

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TEMPEST

An umbrella term for external electromagnetic radiation from data processing equipment and the security measures used to prevent them. Almost all electronic equipment, including chips, bus pathways and metal communications lines, emanates signals into free space or surrounding conductive objects such as metal cabinets, wires and pipes. Equipment and cables that meet TEMPEST requirements have extra shielding in order to keep data signals from escaping and being picked up by unauthorized eavesdropping. It is also possible to use TEMPEST software that generates sufficient electronic noise to mask meaningful radio-frequency emissions.

TEMPEST was a code name for U.S. military operations throughout the 1960s. The name was turned into several informal reverse acronyms such as Telecommunications Electronics Material Protected from Emanating Spurious Transmissions or Transient ElectroMagnetic Pulse Emanation STandard (see backronym). See emanation and EMSEC.
References in classic literature ?
No, my dear Dick; the night is close at hand--a threatening night with a tempest in the background--and the storms are awful in this country, where the heated soil is like one vast electric battery.
There had been no abatement in the ferocity of the tempest, nor was there indication of any.
I shrieked, upstarting-- "Get thee back into the tempest and the Night's Plutonian shore
The house occupied by the family was on the slope of a mountain, and after a long drought there was a terrible tempest which not only raised the river to a great height but loosened the surface of the mountain so that a great landslide took place.
When the heat-cloud sucks the tempest, when the slivered pine-trees fall, When the blinding, blaring rain-squalls lash and veer; Through the war-gongs of the thunder rings a voice more loud than all-- It is Fear, O Little Hunter, it is Fear!
One evening a fearful tempest arose, it thundered and lightened, and the rain poured down from the sky in torrents: besides, it was as dark as pitch.
Now, the day was drawing towards the night, and the air was very still, for the heat was great and a tempest was gathering, as I, who am a Heaven-Herd, knew well.
The tempest was let loose and beating the atmosphere with its mighty wings; from time to time a flash of lightning stretched across the heavens like a fiery serpent, lighting up the clouds that rolled on in vast chaotic waves.