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CI

Across
Intelligence gathered via satellite and aerial photography
Intelligence-gathering by interception of signals, whether communications between people or from electronic signals not directly used in communication
An activity aimed at protecting an agency's intelligence program from an opposition's intelligence service
The act of obtaining secret or confidential information. Also referred to as 'spying'
Down
The practice of defending computers, servers, mobile devices, electronic systems, networks, and data from malicious attacks.
A technical branch of intelligence gathering which serves to detect, track, identify, or describe the distinctive signatures of fixed or dynamic target sources. Includes radar/acoustic/nuclear/chemical and biological intelligence
Intelligence gathered by means of interpersonal contact
A planned action aimed at weakening a polity, effort, or organization through subversion, obstruction, or destruction
The United Kingdom has the separate Security Service, also known as ____, through which it builds its domestic counterintelligence and counterterror efforts with its counterparts in law enforcement
Malicious software