Article | REF: E1345 V1

Electromagnetic spying – TEMPEST Risks, analysis, validation and standards

Authors: Alain ALCARAS, Jean-François GAENG

Publication date: February 10, 2024

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3. Phenomenology TEMPEST

3.1 Definitions of TEMPEST terms

Here are the definitions of the main terms in the TEMPEST domain:

  • TEMPEST Security Zone (TSZ): a zone in which permanent measures are taken to detect and prevent any espionage activity; this is the "controlled zone" within which it is guaranteed that a hostile individual is not present. The worst case, therefore, is when the hostile individual is at the boundary of the ZST;

  • Red signal (SR): intentional electrical signal carrying sensitive information (necessarily located in the ZST), e.g. the "clear" signal of an encoder;

  • Black signal (SN) : intentional electrical signal not carrying sensitive information, for example the "ciphered" signal...

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Phenomenology TEMPEST