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The network code-named 'Red' at Bletchley Park was broken regularly and quickly from 22 May 1940 until the end of hostilities. Indeed, the Air Force section of Hut 3 expected the new day's Enigma settings to have been established in Hut 6 by breakfast time.
The Abwehr code had been broken on 8 December 1941 by Dilly Knox. Agents sent messages to the Abwehr in a simple code which was then sent on using an Enigma machine. The simple codes were broken and helped break the daily Enigma cipher. This breaking of the code enabled the Double-Cross System to operate. [19]
X, Y & Z: The Real Story of How Enigma Was Broken is a 2018 book by Dermot Turing about the Enigma machine, which was used by Nazi Germany in World War II, and about the French, British, and Polish teams that worked on decrypting messages transmitted using the Enigma cipher.
The nations involved fielded a plethora of code and cipher systems, many of the latter using rotor machines. As a result, the theoretical and practical aspects of cryptanalysis, or codebreaking, were much advanced. Possibly the most important codebreaking event of the war was the successful decryption by the Allies of the German "Enigma" Cipher.
Władysław Kozaczuk, Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two, edited and translated by Christopher Kasparek, Frederick, MD, University Publications of America, 1984. Hugh Sebag-Montefiore, Enigma: the Battle for the Code, London, Weidenfeld & Nicolson, 2000. (Provides information on ...
The B-Dienst, created in the early 1930s, had broken the most widely used British naval code by 1935. When war came in 1939, B-Dienst specialists had broken enough British naval codes that the Germans knew the positions of all British warships. They had further success in the early stages of the war as the British were slow to change their codes.
Milestones was given for "First Breaking of Enigma Code by the Team of Polish Cipher Bureau, 1932-1939", they built the ‘bomba’ – the first cryptanalytic machine to break codes. Their work was a foundation of British code breaking efforts which, with later American assistance, helped end World War II. [6]
The Bureau modified its commercial Enigma rotors, reflector, and internal wiring to match the military Enigma's. The Cipher Bureau's commercial Enigma did not have a plugboard, but the plugboard could be simulated by relabeling the keys and lamps. [6] The result was the first Polish Enigma double.