signals intelligence
Eavesdropping for spies
Signals intelligence is information gathered by intercepting electronic communications and other signals—radio transmissions, phone calls, emails, radar emissions.
Often abbreviated SIGINT, it's a major component of modern espionage and military operations: The agency's signals intelligence revealed troop movements along the border.
Distinguished from human intelligence (HUMINT), which comes from personal sources.
- interceptSeize en route
- codebreakingSolving secret communications
- EnigmaGerman encryption apparatus
- radar detectionIdentifying objects using radiowaves
- eavesdroppingSecretly listening to others
listening post · surveillance · listening devices · wiretapping · Bletchley · monitoring · electronic warfare · reconnaissance · traffic analysis · code breaking · SIGINT · Five Eyes · listening · classified · top secret · black site · decrypt · covert
- espionagespy, spies, double agent, double agents, spying
- Intelligence AgenciesCIA, FBI, NSA, MI5, MI6
- NSANSA, SIGINT, cryptanalysis, codebreaking, electronic surveillance
- signals intelligenceSIGINT, intercept, interception, intercepts, eavesdropping
- Surveillance AllianceFive Eyes, NSA, SIGINT, data sharing, mass surveillance
- securitysecurity guard, security cameras, alarm system, security system, lock
signals intelligencehuman intelligence
Innate mental capacity
HUMINT · case officers · spy networks · espionage · interrogation
signals intelligencepublic information
Accessible-to-all data
news media · academic research · press releases · public records · social media monitoring
signal, intelligent, intelligence, signals, unintelligent, intelligible, signaling, intelligently, unintelligible