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National Security Agency
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- Round the world "eavesdropping". This means that they listen to what people are saying in other countries, without letting them know that they are listening. They monitor, collect, decode, translate and analyse information and data. This is known as signals intelligence (SIGINT).
- NSA also protects the U.S. from eavesdropping and SIGINT spying by foreign governments and agencies. This is protection against "penetration and network warfare". The agency does this by clandestine means, among which are bugging electronic systems, and sabotaging their computer networks with viral software.
- "About NSA: Mission". National Security Agency. http://www.nsa.gov/about/mission/index.shtml. Retrieved September 14, 2014.
- Nakashima, Ellen. January 26, 2008. Bush order expands network monitoring. The Washington Post. Retrieved February 9, 2008. 
- Executive Order 13470 — 2008 Amendments to Executive Order 12333, United States Intelligence Activities, July 30, 2008 (PDF)
- Malkin, Bonnie. NSA surveillance: US bugged EU offices. The Daily Telegraph, June 30, 2013
- Ngak, Chenda. NSA leaker Snowden claimed U.S. and Israel co-wrote Stuxnet virus, CBS, July 9, 2013
- Bamford, James. The Secret War, Wired Magazine, June 12, 2013.
- Bamford, James, The Puzzle Palace, Penguin Books, ISBN 0-14-006748-5.
- Bamford, James, The Shadow Factory, Anchor Books, 2009, ISBN 978-0-307-27939-2.
- Church Committee, Intelligence Activities and the Rights of Americans: 1976 US Senate Report on Illegal Wiretaps and Domestic Spying by the FBI, CIA and NSA, Red and Black Publishers (May 1, 2008).
- Hanyok, Robert J. (2002). Spartans in Darkness: American SIGINT and the Indochina War, 1945–1975. National Security Agency. http://www.fas.org/irp/nsa/spartans/index.html. Retrieved November 16, 2008.
- Aid, Matthew, The Secret Sentry: The Untold History of the National Security Agency, 432 pages, ISBN 978-1-59691-515-2, Bloomsbury Press (June 9, 2009).
- Shaker, Richard J. "The Agency That Came in from the Cold." (Archive, Archive #2) Notices. American Mathematical Society. May/June 1992 pp. 408–411.
- Jackson, David (June 18, 2013). Obama: NSA surveillance programs are 'transparent'. https://www.usatoday.com/story/theoval/2013/06/18/obama-charlie-rose-program-nsa-surveillance/2433549/. Retrieved June 18, 2013.
- "National Security Agency Releases History of Cold War Intelligence Activities." George Washington University. National Security Archive Electronic Briefing Book No. 260. Posted November 14, 2008.
- The NSA Files. London. June 8, 2013. http://www.guardian.co.uk/world/the-nsa-files.