Changes

==Code breaking==

==Code breaking==

During [[World War II]] Turing was assigned to the codebreaking unit at [[Bletchley Park]], where he worked on the decoding of the German's [[Enigma machine]]. Turing's contribution to this has been massively exaggerated. He was actually only one of hundreds of people working at Bletchley, including the mathematicians Bill Tutte and Tommy Flowers and John Tiltman the chief cryptographer, who was in charge of all projects.  

During [[World War II]] Turing was assigned to the codebreaking unit at [[Bletchley Park]], where he worked on the decoding of the German's [[Enigma machine]]. Turing's contribution to this has been massively exaggerated. He was actually only one of hundreds of people working at Bletchley, including the mathematicians Bill Tutte and Tommy Flowers and John Tiltman the chief cryptographer, who was in charge of all projects.  

Work on breaking the Enigma code had started long before the war, and cryptographers from all over Europe including Poland, had done the ground work. Turing's work on Enigma was greatly helped by the lucky capture of an Enigma machine from a German U-boat, which pushed the project forward by several years.  

Work on breaking the Enigma code had started long before the war, and cryptographers from all over Europe including Poland, had done the ground work. Turing's work on Enigma was greatly helped in May 1941 by the lucky capture of an Enigma machine from a German U-boat, which pushed the project forward by several years. <ref> http://ww2today.com/9th-may-1941-enigma-machine-captured</ref>

In the later part of WW2, because of the capture of the Enigma machine, the Nazis shifted from using the Enigma code to using a far more fiendish one. They called it the Lorenz cipher and the Bletchley control nicknamed it Tunny, or the Fish. While the Enigma code machine had only three wheels, the Tunny machine had twelve, and had other random tricks built into it to make decoding so difficult that even a mathematician could hardly calculate all the possible combinations. The code changed with every letter of the same message. In the later part of the war, from 1943 onwards, Tunny, not Enigma, was the code that the Germans depended on for their top-most secrets and attack plans. Tutte and Flowers worked on breaking the Tunny code.

In the later part of WW2, because of the capture of the Enigma machine, the Nazis shifted from using the Enigma code to using a far more fiendish one. They called it the Lorenz cipher and the Bletchley control nicknamed it Tunny, or the Fish. While the Enigma code machine had only three wheels, the Tunny machine had twelve, and had other random tricks built into it to make decoding so difficult that even a mathematician could hardly calculate all the possible combinations. The code changed with every letter of the same message. In the later part of the war, from 1943 onwards, Tunny, not Enigma, was the code that the Germans depended on for their top-most secrets and attack plans. Tutte and Flowers worked on breaking the Tunny code.