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More explanation of Colossus computer secracy - to mid-1970's


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Firstly the plans for Colosuus were given to the USA as part of war debt repayment, IBM were only capable of making mechanical adding machines. Second the whole ENIGMA was suppresed post WW2 , A) Because on the day of the German surrender May 9th 1945, the whole system started on the Russian armed forces B) It was considered important that the 'cult' of Germany had not be defeated militarily but forced to surrender through treachery, as happned post Great War should not start again. The first Computer with a memeory was invented by Manchester University in 1957, again pressure from USA led to it going over the pond. The other thing is that many mechanical chyper machines were used up to 1970's and belived to be secure, it was only the introduction of the first portable computers rendered the mechanical systems obsolete so there was little need for secrecy as far Bletchley Park was concerned.

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