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Cryptography has always been an important tool for the U.S. government to use in providing security and protection to its citizens, particularly during wars. The significance of sending and receiving coded messages has been enhanced since the terrorist attacks on the United States on September 11, 2001. The leading government agency dedicated to cryptanalysis is the National Security Agency (NSA), which is administered by the Department of Defense. The Central Security Service (CSS), a partner with NSA, is responsible for the cryptanalysis activities in all branches of the U.S. military (army, air force, navy, and marines).