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explores the making and breaking of codes. Read declassified top secret documents (Korean War, Kennedy assassination, Cuban Missile Crisis). Discover the history of codebreaking. Solve cryptograms. Learn about careers. (National Security Agency)
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Breaking a cipher, also known as cryptanalysis, without having the key is quite difficult and very time consuming. And, depending on the type of cipher system used to create the secret message, there may be more than one key that cracks the code. |
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Cipher disk |
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Privacy 
