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Cryptography --- Machine ciphers --- World War, 1939-1945 --- Cryptographie --- 2ème guerre mondiale --- -European War, 1939-1945 --- Second World War, 1939-1945 --- World War 2, 1939-1945 --- World War II, 1939-1945 --- World War Two, 1939-1945 --- WW II (World War, 1939-1945) --- WWII (World War, 1939-1945) --- History, Modern --- Ciphers --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Signs and symbols --- Symbolism --- Writing --- Data encryption (Computer science) --- -Cryptography --- 2ème guerre mondiale --- Cryptography. --- Indian code talkers --- Communications --- Cryptografie.