National Security Agency

Definition and stakes

9/11 Commission Report — Chapter 3

“ Intelligence agencies under the Department of Defense account for approximately 80 percent of all U.S. spending for intelligence, including some that supports a national customer base and some that supports specific Defense Department or military service needs.66 As they are housed in the Defense Department, these agencies are keenly attentive to the military’s strategic and tactical requirements. One of the intelligence agencies in Defense with a national customer base is the National Security Agency, which intercepts and analyzes foreign communications and breaks codes. ”
Source: Wikisource

9/11 Commission Report — Chapter 3

“ The National Security Agency The National Security Agency’s intercepts of terrorist communications often set off alarms elsewhere in the government. Often, too, its intercepts are conclusive elements in the analyst’s jigsaw puzzle. NSA engineers build technical systems to break ciphers and to make sense of today’s complex signals environment. Its analysts listen to conversations between foreigners not meant for them. They also perform “traffic analysis”—studying technical communications systems and codes as well as foreign organizational structures, including those of terrorist organizations. ”
Source: Wikisource

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