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Encyclopedia / Security, Defense & Protective Services

National Security and Intelligence

Specialty Knowledge entries in National Security and Intelligence.

The J. Edgar Hoover Building, headquarters of the Federal Bureau of Investigation

Counterintelligence

Overview Counterintelligence is the set of activities aimed at protecting a nations secrets and institutions from the intelligence operations of rival powers. Where ordinary intelligence collection looks outward to learn about an adversary, counterintelligence looks inward and sideways, asking who might be trying to steal, distort, or sabotage ones own information. Defensive and Offensive Measures

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Counterintelligence is the activity of identifying and neutralizing the intelligence operations of hostile foreign powers.

Captured members of Brigade 2506 following the failed Bay of Pigs invasion, 1961

Covert Operations

Overview Covert operations are activities a government undertakes to shape events in another country while denying its own involvement. The defining feature is not secrecy about the act itself, which may become publicly visible, but secrecy about who ordered and funded it, allowing the sponsoring government plausible deniability. Forms of Covert Action Covert action takes

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Covert operations are government actions intended to influence events abroad while concealing the identity of the sponsoring government.

A cyber-defense specialist practices offensive and defensive cyber operations techniques during a training exercise

Cyber Warfare

Overview Cyber warfare describes digital attacks that a nation-state, or a group acting on its behalf, directs against the computer systems of another nation. Unlike ordinary cybercrime carried out for financial gain, cyber warfare pursues strategic or military goals, whether disrupting an enemys power grid, stealing defense secrets, or disabling command networks ahead of a

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Cyber warfare is the use of digital attacks by a nation or state-backed group to damage, disrupt, or spy on another nations computer systems.

A German Enigma cipher machine on display at the National Cryptologic Museum

Espionage

Overview Espionage is the clandestine acquisition of secret information, most often conducted by one government against another, though corporations and other organizations practice it as well. Every state both runs espionage operations and punishes espionage committed against it, a contradiction that has shaped the practice for as long as organized governments have existed. Methods and

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Espionage is the practice of secretly gathering confidential information, typically on behalf of a government, without the consent of the party holding it.

Members of the United Nations Security Council prepare for a debate

Geopolitical Risk Analysis

Overview Geopolitical risk analysis is the discipline of assessing how political instability, conflict, and shifting alliances abroad might affect the interests of a government, military, or company. It blends regional expertise with economic and military data to produce forward-looking judgments rather than simple historical accounts of what has already happened. Applications National security planners use

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Geopolitical risk analysis is the systematic assessment of how political, military, and economic developments abroad could affect a nation, company, or investment.

Ceremonial opening of the Department of Homeland Security headquarters at the St. Elizabeths campus

Homeland Security

Overview Homeland security refers to the range of government efforts aimed at protecting a nations own territory and population, as distinct from traditional national security, which focuses on projecting power and deterring threats abroad. The modern concept took on its current shape in the United States after the September 11, 2001 attacks exposed gaps between

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Homeland security is the national effort to prevent terrorist attacks, secure borders, and prepare for and respond to disasters within a countrys own territory.

The Glienicke Bridge, known as the Bridge of Spies, used for Cold War spy exchanges

Human Intelligence

Overview Human intelligence, abbreviated HUMINT, refers to information obtained directly from people rather than from machines or intercepted signals. It is among the oldest forms of intelligence collection, practiced by rulers and generals long before any electronic sensor existed, and it remains central to modern espionage because some secrets are never written down or transmitted

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Human intelligence, or HUMINT, is information collected from human sources through direct contact, such as espionage, interviews, and liaison relationships.

The CIA seal inlaid in the floor of the main lobby of the Original Headquarters Building

Intelligence Cycle

Overview The intelligence cycle describes the repeating process through which national security organizations turn raw data into usable knowledge. It begins when policymakers identify gaps in their understanding and ends when finished analysis reaches those same decision-makers, who then raise new questions that restart the cycle. Stages of the Cycle Analysts commonly describe five linked

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The intelligence cycle is the process by which raw information is collected, processed, analyzed, and turned into finished intelligence for decision-makers.

President Obama convenes a meeting of the National Security Council in the White House Situation Room

National Security Strategy

Overview A national security strategy is the highest-level statement a government produces about the dangers it sees in the world and how it intends to respond to them. Rather than focusing narrowly on the armed forces, a modern national security strategy typically weaves together military, economic, diplomatic, and homeland concerns into a single coherent outlook.

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A national security strategy is a formal document in which a government sets out its priorities, threats, and plans for protecting the nation.

Headquarters of the National Security Agency at Fort Meade, Maryland

Signals Intelligence

Overview Signals intelligence, commonly abbreviated SIGINT, is the practice of intercepting electronic transmissions to extract information of military, diplomatic, or economic value. It sits alongside human intelligence and imagery intelligence as one of the primary disciplines used by national security agencies to understand adversaries and allies alike. Branches of SIGINT Communications intelligence, or COMINT, focuses

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Signals intelligence, or SIGINT, is intelligence gathered by intercepting electronic signals and communications.