The Colossus Mark II

Colossus Mark II

The opening improved Colossus Mark II with 2400 vacuum tubes was operational by the side of Bletchley recreational area scarcely in the field of stage in favor of the Normandy Landings.

By the come to an end of the war nearby were ten Colossus computers operating. They enabled the decryption of 63,000,000 typescript of high-grade German messages. Even though these gear incorporated skin texture of special use electronic digital computers, and had limitless influence on the outcome of WWII, they had minute influence, in the field of the traditional intelligence, on the development of computing know-how as they remained top secret until with reference to 1970.

"The Colossus computers were used to help make sense of teleprinter messages which had been encrypted using the Lorenz SZ40/42 device — British codebreakers referred to encrypted German teleprinter traffic in the role of "Fish" and called the SZ40/42 device and its traffic in the role of 'Tunny'. Colossus compared two data streams, plus both match based on a programmable Boolean function. The encrypted message was read by the side of area of high pressure rate from a paper tape. The other torrent was generated internally, and was an electronic simulation of the Lorenz device by the side of various trial settings. If the match count in favor of a setting was beyond a precise threshold, it would come about sent in the role of output to an exciting typewriter" (Wikipedia article on Colossus laptop, accessed 11-23-2008).

In the field of stride 2012 the Colossus Rebuild Project by National Museum of Computing at Bletchley Park had accomplished an operating restoration of a Colossus II, in the same way as 10 years and concluded 6,000 man-days of volunteer effort. The Rebuild stands in the field of its historically correct place, the room H Block, in Bletchley Park, anywhere Colossus no. 9 stood in the field of WW II.