Key Phrases - Statistically Improbable Phrases (SIPs):
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symbol cryptography, fractionating ciphers, extinct scripts, flag telegraphy, wheel cypher, digraphic cipher, cryptic group, null ciphers, wigwag system, enciphered code, cipher alphabet, cipher device, cipher disk, jargon codes, priming key, plaintext letters, aerial telegraph, plaintext alphabet, ciphertext letter, cryptologic history, plaintext words, polyalphabetic ciphers, plaintext characters, solution seekers, polyalphabetic substitution
Key Phrases - Capitalized Phrases (CAPs):
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World War, United States, Royal Navy, Civil War, State Department, New York, Old Persian, Albert Myer, International Morse, William Friedman, Asia Minor, Middle Ages, American Revolution, American Trench Code, Rosetta Stone, Royal Army, Voynich Manuscript, Easter Island, Great Britain, Alexander the Great, Army Signal Corps, British Isles, Chain of Death, Charles Wheatstone, Cold War
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