National Security Agency (NSA), U.S. intelligence agency within the Department of Defense that is responsible for cryptographic and communications intelligence and security. Its headquarters are in Fort Meade, Maryland.
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The NSA grew out of the communications intelligence activities of U.S. military units during World War II. It was established in 1952 by a presidential directive from Harry S. Truman in which he specified its mission as
to provide an effective, unified organization and control of the communications intelligence activities of the United States conducted against foreign governments, to provide for integrated operational policies and procedures pertaining thereto.
The NSA was created in part out of the belief that the importance and distinct character of communications intelligence warranted an organization distinct from both the armed forces and the other intelligence agencies. While it operates within the Department of Defense, the NSA also belongs to the Intelligence Community (a coalition of 17 intelligence agencies) and as such acts under the supervision of the director of national intelligence. The director of the NSA is a military officer of flag rank (i.e., a general or an admiral) with a minimum of three stars. Not being a creation of Congress, the NSA often acts outside of congressional review; it is the most secret of all U.S. intelligence agencies.
The agencys mission includes the protection and formulation of codes, ciphers, and other cryptology for the U.S. military and other government agencies as well as the interception, analysis, and solution of coded transmissions by electronic or other means. The agency conducts research into all forms of electronic transmissions. It also operates posts for the interception of signals around the world. In 1972 a joint organization, the Central Security Service (CSS), was created to coordinate the intelligence efforts of the NSA with the U.S. military. The director of the NSA also heads the CSS (under the title of Chief, CSS).
The 1978 Foreign Intelligence Surveillance Act (FISA) restricts the NSA mandate to the interception of foreign communications and forbids the agency from targeting a U.S. citizen unless the latter is considered an agent of a foreign power. In exceptional cases that are considered critical to national security, the agency can obtain a warrant to intercept domestic communications. In 2008, amendments to FISA relaxed those restrictions and allowed the agency to monitor domestic communications without a warrant as long as one party is reasonably believed to be outside the United States.
In 2013 NSA activities were put in the limelight after a former computer security contractor, Edward Snowden, leaked classified information about two surveillance programsone collecting information from U.S. Internet service providers (PRISM) and the second collecting so-called metadata on cellular phone calls (information including phone numbers and length of the calls but not their content). Those programs were designed to target non-Americans, but they also collected a massive amount of information from Americans with whom those individuals had communicated. Other NSA programs included the extensive, worldwide, and allegedly untargeted collection of text messages (Dishfire) and of the locations of cell phones.
While less known to the American public than the Central Intelligence Agency, the NSA is believed to be far larger in size in terms of workforce and budget. According to Michael Hayden, a former director (19992005) of the NSA, it is also the worlds largest collector of foreign signals intelligence.
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National Security Agency | History, Role, & Surveillance ...
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