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> RECORD OBS-0298 | status: PARTIALLY SUBSTANTIATED | filed 2026-07-31
Home > Government > TEMPEST: Government surveillance via electromagnetic emanations

TEMPEST: Government surveillance via electromagnetic emanations

RecordOBS-0298
CategoryGovernment/Surveillance
StatusPARTIALLY SUBSTANTIATED
SummaryTEMPEST is a U.S. NSA codename and NATO certification for spying on information systems through unintentional electromagnetic, acoustic, and vibration emanations. It also covers protective measures like shielding and filtering to prevent such surveillance. The concept is documented in official sources and is a recognized cybersecurity concern.
OriginThe term originated in the late 1960s as a U.S. government project, with roots in World War II discoveries by Bell Labs about recovering plaintext from encrypted teleprinter signals.
Claimed
  • Electronic devices emit electromagnetic radiation that can be intercepted to reconstruct data.
  • Government agencies use TEMPEST methods to spy on computer emissions.
  • TEMPEST standards mandate shielding, distance, and filtering to protect against such eavesdropping.
Evidence / consensusThe existence of compromising emanations and the need for protection is well-documented by government and cybersecurity sources. However, the specific methods used by the NSA are classified, and the extent of actual surveillance is not publicly confirmed.
> OBSERVER NOTE:
A real, documented phenomenon. The conspiracy angle is the secrecy of the methods, but the basic science is established. File under surveillance, not fiction.

Sources

  1. Tempest (codename) - Wikipedia
  2. What Is TEMPEST? | Cybersecurity RF & Electromagnetic Shielding
  3. TEMPEST and Electromagnetic Security | National Cyber Security Centre
  4. TEMPEST Classification Levels Explained | MAJR Products

Sources are external and provided for verification. Listing does not imply the Observer endorses their claims.