National Security Agency(NSA)

Agency

Legal Definition of National Security Agency

Defense Department agency charged with carrying out U.S. communications-security and intelligence-gathering activities. Besides prescribing and overseeing certain security principles and procedures for the U.S. government, and conducting certain foreign intelligence operations, the NSA regulates certain communications channels and operates a national computer security center in support of its defense mission.

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to gather or build up little by little

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