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The '''National Security Agency''' (NSA) is the United States's cryptologic organization. An agency within the [[Department of Defense]], it is believed to be the largest U.S. government intelligence gathering agency.  

The '''National Security Agency''' (NSA) is the United States's cryptologic and signals intelligence organization. An agency within the [[Department of Defense]], it is believed to be the largest U.S. government intelligence gathering agency.  

Responsible for the collection and analysis of foreign communications, it coordinates, directs, and performs highly specialized activities to produce foreign signals intelligence information. This involves a significant amount of cryptanalysis. It's also responsible for protecting U.S. government information systems and communications from similar agencies elsewhere, which involves a significant amount of cryptography.

Responsible for the collection and analysis of foreign communications, it coordinates, directs, and performs highly specialized activities to produce foreign signals intelligence information. This involves a significant amount of cryptanalysis. It's also responsible for protecting U.S. government information systems and communications from similar agencies elsewhere, which involves a significant amount of cryptography.