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Communications security (COMSEC) is

the protection resulting from measures designed to deny unauthorized persons information of value that might be derived from the possession and study of telecommunications, or to mislead unauthorized persons in their interpretation of the results of such possession and study.[1]
[t]he protective measures taken to deny unauthorized persons information derived from telecommunications of the United States Government related to national security and to ensure the authenticity of such communications. Such protection results from the application of security measures (including cryptosecurity, transmission security, and emissions security) to electrical systems generating, handling, processing, or using national security information. It also includes the application of physical security measures to communications security information or materials.[2]


Communications security includes:


  1. U.S. Department of Defense, Joint Pub. 1–02: DOD Dictionary of Military and Associated Terms (Apr. 2010) (full-text).
  2. Tempest Glossary, at 2.

See also[]