Spying

The practice of spying or of using spies, typically by governments to obtain political and military information.

• counter intelligence

• espionage

• double agent

• intelligence

• decoy

A person pretending to work as a spy for one government, while actually spying for another government.

• decoy

• espionage

• double agent

• counter intelligence

• intelligence

Close observation, especially of a suspected spy or criminal.

• surveillance

• double agent

• decoy

• espionage

• intelligence

System for disguising a message by replacing its words with groups of letters or numbers.

• code

• espionage

• double agent

• decoy

• intelligence

The secret information itself.

• decoy

• espionage

• double agent

• intelligence

• counter intelligence

Someone or something that looks like the original spy (or spy’s vehicle). Their purpose is to distract and to lure an enemy away from the original spy.

• counter intelligence

• intelligence

• espionage

• double agent

• decoy

Kept secret or done secretively, especially because it is illegal.

• double agent

• clandestine

• decoy

• espionage

• intelligence

The activity of preventing the enemy from obtaining secret information.

• decoy

• intelligence

• double agent

• espionage

• counter intelligence