personnel security communications security comsec informations system security infosec security classification operations security opsec disciplines involved positive security measures one 's society collects information actual potential security complement security example communications intelligence identifies particular radio transmitter one used particular country detecting transmitter inside one 's country suggests presence spy counterintelligence target particular counterintelligence significant relationship collection discipline humint least relationship others counterintelligence produce information protect
Applied science Military sciences Tactics Counter-intelligence