![]() ![]() The existence of the Colossus machines was kept secret until the mid-1970s the machines and the plans for building them had previously been destroyed in the 1960s as part of the effort to maintain the secrecy of the project. Bletchley Park's use of these machines allowed the to obtain a vast amount of high-level from intercepted messages between the ( OKW) and their commands throughout occupied Europe. ![]() Ten Colossi were in use by the end of the war and an eleventh was being commissioned. An improved Colossus Mark 2 that used to quintuple the processing speed, first worked on 1 June 1944, just in time for the on D-Day. ![]() The prototype, Colossus Mark 1, was shown to be working in December 1943 and was operational at Bletchley Park by January 1944 according to some sources and certainly by 5 February 1944. Turing's machine that helped decode was the electromechanical, not Colossus. ![]()
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