Reference · Secure facilities & shielding
TEMPEST
TEMPEST — control of compromising emanations
TEMPEST refers to the study and control of compromising electromagnetic emanations — the unintended signals leaking from electronic equipment that could reveal the information it processes. TEMPEST shielding and zoning attenuate those emanations so an adversary cannot reconstruct the data.
What it is
Electronic equipment radiates unintended signals that correlate with the data it handles. TEMPEST is the discipline of measuring, containing, and mitigating those compromising emanations — through shielding, filtering, and physical separation (zoning).
Why it exists
Without countermeasures, an adversary with the right antenna and receiver could recover classified information from a distance. TEMPEST controls close that channel.
Who it applies to
Facilities and equipment that process classified information. In SCIF construction, TEMPEST requirements drive RF shielding and the separation of RED (classified) and BLACK (unclassified) systems.
Frequently asked
What is TEMPEST shielding?
TEMPEST shielding is the electromagnetic containment used to stop compromising emanations from leaking out of a facility. It combines conductive (RF) shielding, filtered penetrations, and physical zoning so signals that could reveal classified data cannot be intercepted.
Sources
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