Cryptanalysis of the Enigma by the letters on the top row of the Enigma keyboard. So, "continuation of message sent at 2330" was represented as "FORTYWEEPYYWEEPY". "Cribs" were fundamental to the British approach to solving Enigma keys, but guessing the plaintext for a message was a highly skilled business. So in 1940 Stuart Milner-Barry set up a special "Crib Room" in Hut 8. Foremost amongst the knowledge needed for identifying cribs was the text of previous decrypts. Bletchley Park maintained detailed indexes of message preambles, of every person, of every ship, of every unit, of every weapon, of every technical term and of repeated
Arizona during World War II Johnston, a World War I veteran who had lived in the Navajo reservation of Arizona and was fluent in the Navajo language. Johnston and the "original twenty-nine," as they were known, are credited with developing the original code, however, it was modified and improved by others as the war progressed. At least 540 Navajos served in the Marine Corps during World War II, about 400 of whom were trained as code talkers. Because many of them lacked birth certificates, it was impossible to verify the age of some recruits. After the war it was revealed that boys as young as