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TEMPEST is a U.S. government codename for a set of standards for limiting electric or electromagnetic radiation emanations from electronic equipment such as microchips, monitors, or printers. It is a counter-intelligence measure aimed at the prevention of radiation espionage, also known as RINT (or, disputedly, RADINT). The term TEMPEST is often used more broadly for the entire field of compromising emanations or Emissions Security (EMSEC). Basic TEMPEST information has not been classified since 1995. Although short excerpts from the main U.S. TEMPEST standard, NSTISSAM TEMPEST/1-92, are now publicly available, all the actual emission limits and test procedures defined in it remain classified and have been redacted from the published version. The NATO equivalent AMSG 720B is also still classified. The NSA publishes lists of labs approved for TEMPEST testing and equipment that has been certified. The United States Army has a TEMPEST testing facility, as part of the U.S. Army Information Systems Engineering Command, at Fort Huachuca, Arizona. Similar lists and facilities exist in other NATO countries. TEMPEST certification must apply to entire systems, not just to individual components, since connecting a single unshielded component (such as a cable) to an otherwise secure system could easily make it radiate dramatically more RF signal. This means that users who must specify TEMPEST certification could pay much higher prices, for obsolete hardware, and be severely limited in the flexibility of configuration choices available to them. A less-costly approach is to place the equipment in a fully shielded room

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