Communications security monitoring

Military
Communications security monitoring is

"[t]he act of listening to, copying, or recording transmissions of one’s own circuits (or when specially agreed, e.g., in allied exercises, those of friendly forces) to provide material for communications security analysis in order to determine the degree of security being provided to those transmissions. In particular, the purposes include providing a basis for advising commanders on the security risks resulting from their transmissions, improving the security of communications, and planning and conducting manipulative communications deception operations."