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- 652.8 6
- Cryptography -- Periodicals 6
- Ciphertext-only -- cryptanalysis -- Doppelkasten -- Doppelkastenschlüssel -- double boxes -- double Playfair -- field cipher -- German Army -- NI cipher -- radio message -- seriation -- trigram statistics -- Truppenschlüssel -- two-box cipher -- two-square cipher -- unicity distance -- unsolved ciphers 1
- Cryptanalysis -- Czechoslovakia -- reconstruction -- Slovak State -- Josef Štolba 1
- David Kahn -- Enigma machine -- Government Communications Headquarters (GCHQ) -- National Security Agency (NSA) 1
- Elizebeth Smith Friedman -- David Kahn -- prohibition -- U.S. Coast Guard 1