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'Why was Bletchley Park able to break the German Enigma Codes?' The Enigma machine was a complicated machine that looked like typewriter, inside a wooden box. It had

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Introduction

History Coursework Year 10 'Why was Bletchley Park able to break the German Enigma Codes?' The Enigma machine was a complicated machine that looked like typewriter, inside a wooden box. It had two keyboards, one to type in the message, and one to display the decoded message. It also consisted of 5 rotors (later increased to make it more secure), and 10 plugs to set up the machine. The rotors each contained 26 letters (the alphabet). To use the machine, both the sender and the recipient had to set their machines the exact same way, using the plugs and rotors. Using the codebook, 3 of the 5 rotors were set, for example "N.J.A". And the ten different plugs were placed into the sockets, for example Plug 3 was put in sockets B and C. These settings were changed at least once a day once the war had begun. After the machine was set, the sender could then type in his message, and receive it on the higher keyboard as a cipher. This cipher was then sent to the recipient by morse code. The recipient then typed the cipher into his machine (set exactly the same way), and received the decoded message on the higher keyboard. ...read more.

Middle

This also could also be used to work out the settings. John Herivel, a 21-year-old mathematician, used these mistakes made by the Germans as a base for his ingenious idea. He attempted to exploit these mistakes by trying to imagine a German enigma operator's daily routine. He assumed that the operators would not be too careful when sending messages, as they believed that the machine was unbreakable. Herivel thought that the German operators might send the three letters that they could see when the lid of the Enigma machine was closed, instead of a random message. If this were true, the settings for the day would be given away. Herivel's idea was ingenious and was greeted by great enthusiasm. However, it did not work at first, as there were too few messages sent in February and March 1940. Although after the invasion of Denmark and Norway, the method became more successful as there was a great increase in the number of messages sent each day. This made it easier, as there was a greater chance of finding similar messages. Alan Turing was another man who is known for his great individual effort to breaking the Enigma codes. He was the creator of the 'bombes'. ...read more.

Conclusion

However, the main breakthrough in cracking the 'Dolphin' came when Harry Hinsley, an intelligence officer, discovered that German weather ships also carried codebooks. When two were captured, they provided codebooks for June and July. Using all theses clues as well as other methods, Bletchley Park was able to crack the 'Dolphin' in July 1941 and continued to break its codes until the end of the war. There were many reasons why Bletchley Park was able to break the Enigma Codes. The most important reason however, was the Poles assistance. Without the Poles help, Bletchley Park would never of had anything to work from, and would never have been able to break any Enigma codes. It was impossible without a replica, which was just what Poland provided. Other less important reasons why Bletchley Park was able to break the Enigma were the mistakes made by the Germans, and the production of new technology. If the Germans were careful, and did not make any sort of mistakes, the ideas of Turing and Herivel would not have had any success at all. The technology was vital in Bletchley Park as it greatly reduced the time taken to break a message, as it no longer had to be done manually. Without the Poles help, German mistakes and the new technology, the allies would never of had a chance of breaking the Enigma. ?? ?? ?? ?? ...read more.

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