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The primary purpose of Tempest equipment is to prevent eavesdropping through electronic signals. Tempest refers to a series of standards aimed at restricting the emanation of electromagnetic signals from electronic equipment, which could be intercepted and analyzed by unauthorized parties. By implementing Tempest measures, organizations can secure sensitive information processed by electronic devices that could inadvertently leak data through electromagnetic emissions.

This is particularly crucial for environments where sensitive government or commercial data is handled, as it helps mitigate risks associated with electromagnetic analysis, often referred to as "Van Eck phreaking." By ensuring that any electromagnetic radiation emitted from devices does not carry usable information, Tempest equipment serves as a vital component in information security strategies, protecting against potential espionage or unauthorized surveillance efforts.