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-User’s 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, Dorothy Du Boisson, Eleanor Ireland, Ken Myers, and Norman Thurlow
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			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 Edgerley
SECTION 5 T. H. FLOWERS’ LABORATORY AT DOLLIS HILL
22	Dollis Hill at War	Jack Copeland, with David Bolam, Harry Fensom, Gil Hayward, and Norman Thurlow
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	Geheimschreiber Traffic and Swedish Wartime Intelligence			Craig McKay
TECHNICAL APPENDICES—TO DIG DEEPER
A1	Timeline: The Breaking of Tunny			Jack Copeland
A2	The Teleprinter Alphabet			Jack Copeland
A3	The Tunny Addition Square			Jack Copeland
A4	My Work at Bletchley Park			Bill Tutte
A5	The Tiltman Break			Friedrich Bauer
A6	Turingery			Jack Copeland
A7	Δχ-Method			Max Newman
A8	Newman’s Theorem			Friedrich 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 Bauer

Flowers was speaking in his quiet, modest way (writes Jack Copeland). He was telling me about the giant electronic computer he had built for codebreaking during the war. The story was riveting. “There should be a book about Colossus”, I suggested.“A book about Colossus...”, he said softly, almost disbelievingly. His computer’s role in the Allied victory had been secret for so long. I began the search for the codebreakers who could provide the rest of the complex picture. People said “We can‘t talk about a lot of it—Official Secrets Act”. But then British Intelligence declassified a crucial wartime report: 500 pages of previously ultra-secret material. Suddenly doors opened and tongues loosened. More...