Britannica Internet Guide Award

Each title on this page links to a digital facsimile of the original document.

Items of outstanding interest are marked *.

Watch this space — many more documents on Enigma, the Bombe, and Colossus are coming very soon.

Documents which are Crown Copyright are reproduced by permission of the Controller of HMSO.

Documents on Enigma, including the Bombe
Documents on Tunny and Colossus
Reference Articles

Enigma

• Treatise on the Enigma, by A. M. Turing (152 pp.) undated (c. 1940) *
• Visit to National Cash Register Corporation of Dayton, Ohio, by A. M. Turing (9 pp.) Dec 1942 *
• A Cryptographic Dictionary, anon. (98 pp.) 20 July 1944 *
• Cryptographic History of Work on the German Naval Enigma, by C. H. O'D Alexander (122 pp.) undated (c. 1945) *
• The History of Hut Eight, 1939 - 1945, by A. P. Mahon (117 pp.) 1945 *

Tunny and Colossus

• A Cryptographic Dictionary, anon. (98 pp.) 20 July 1944 *
• General Report on Tunny With Emphasis on Statistical Methods, by I. J. Good, D. Michie, G. Timms (507 pp.) undated (1945) *

Reference Articles

• Alan Turing, Codebreaker and Computer Pioneer
• Colossus and the History of Computing