Measures and controls taken to deny unauthorized persons information derived from telecommunications and ensure the authenticity of such telecommunications. Note: Communications security includes cryptosecurity, transmission security, emission security , and physical security of COMSEC material . [ NIS ] ( 188 )
(a) cryptosecurity: [The] component of communications security that results from the provision of technically sound cryptosystems and their proper use. [ NIS ]
(b) emission security : Protection resulting from all measures taken to deny unauthorized persons information of value which might be derived from intercept and analysis of compromising emanations from crypto -equipment, AIS, and telecommunications systems. [ NIS ]
(c) physical security : The component of communications security that results from all physical measures necessary to safeguard classified equipment, material, and documents from access thereto or observation thereof by unauthorized persons. [ JP1 ]
(d) transmission security : [The] component of communications security that results from the application of measures designed to protect transmissions from interception and exploitation by means other than cryptanalysis . [ NIS ]