Colossus: the secrets of Bletchley Park's codebreaking computers

Introduction / Jack Copeland

Section 1. Bletchley Park and the attack on Tunny. 1. A brief history of cryptography from Caesar to Bletchley Park / Simon Singh. 2. How it began : Bletchley Park goes to war / Michael Smith. 3. The German Tunny machine / Jack Copeland. 4. Colossus, codebreaking, and the digital age / Stephen Budiansky. 5. Machine against machine / Jack Copeland. 6. D-Day at Bletchley Park / Thomas H. Flowers. 7. Intercept! / Jack Copeland

Section 2. Colossus. 8. Colossus / Thomas H. Flowers. 9. Colossus and the rise of the modern computer / Jack Copeland. 10. The PC-users guide to Colossus / Benjamin Wells. 11. Of men and machines / Brian Randell. 12. The Colossus rebuild / Tony Sale

Section 3. The newmanry. 13. Mr Newman's section / Jack Copeland with Catherine Caughey ... [et al.]. 14. Max Newman : mathematician, codebreaker, and computer pioneer / William Newman. 15. Living with fish : breaking Tunny in the Newmanry and the Testery / Peter Hilton. 16. From Hut 8 to the Newmanry / Irving John (Jack) Good. 17. Codebreaking and Colossus / Donald Michie

Section 4. The Testery. 18. Major Tester's section / Jerry Roberts. 19. Setter and breaker / Roy Jenkins. 20. An ATS girl in the Testery / Helen Currie. 21. The Testery and the breaking of fish / Peter Edgerey

Section 5. T.H. Flowers' laboratory at Dollis Hill. 22. Dollis Hill at war / Jack Copeland with David Bolam ... [et al.]. 23. The British Tunny machine / Gil Hayward. 24. How Colossus was built and operated : one of its engineers reveals its secrets / Harry Fensom

Section 6. Sturgeon, the fish that got away. 25. Bletchley Park's sturgeon : the fish that laid no eggs / Frode Weierud. 26. German teleprinter traffic and Swedish wartime intelligence / Craig McKay

Technical appendices : to dig deeper. A1. Timeline : the breaking of Tunny. A2. The teleprinter alphabet ; A3. The Tunny addition square / Jack Copeland. A4. My work at Bletchley Park / William T. Tutte. A5. The Tiltman break / Friedrich L. Bauer. A6. Turingery / Jack Copeland. A7. [delta][chi]-method / Max Newman. A8. Newman's theorem / Friedrich L. Bauer. A9. Rectangling / Frank Carter. A10. The motor-wheels and limitations / Jack Good, Donald Michie, and Geoffrey Timms. A11. Motorless Tunny / Jack Good and Donald Michie. A12. Origins of the fish cypher machines / Friedrich L. Bauer.