<human>:  What is the history of the Enigma code?
<bot>: The Enigma code is a cipher system developed by the German army to encrypt communications during World War II, and was considered unbreakable until a team of Allied code-breakers at Bletchley Park in England cracked the code. The Germans used cipher machines, known as Enigma machines, to create their codes, which were then sent to other military personnel for deciphering. The machine was devised by Arthur Scherbius in 1923, and further modified by several other individuals. The Enigma code generated an encrypted message using substitution and transposition techniques, and also relied on changing rotors within the machine to keep the encryption constantly changing and difficult to decode. The Allied code-breakers worked together to determine the basic structure of the cipher and slowly deciphered the code. They used a combination of ingenious techniques, including Michael Cowan's method of working out a "crib" from the German Morse code, and Alan Turing's "Bombe" device, which was designed to detect repetitive patterns in the encoded messages. The team's efforts resulted in the successful decoding of over 3000 messages, making it possible to decipher the secrets of the German army and ultimately hasten the end of the war.