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This report describes the German Tunny encoding machine and tells the full story of how the British broke Tunny and decoded a steady stream of messages from Hitler and other members of the German High Command. It includes an account of Colossus, the world's first large-scale electronic digital computer, installed at Bletchley Park in December 1943.
The report was written at Bletchley Park in 1945 by three codebreakers, Jack Good, Donald Michie, and Geoffrey Timms.
This report was classified until the middle of 2000, when it was released to the Public Record Office, Kew (document reference HW 25/4 and HW 25/5).
The links in the table of contents below lead to a digital facsimile of the entire document.
document is Crown Copyright and is reproduced by permission of the Public