The story of Bletchley Park, the successful intelligence operation that cracked Germany's Enigma Code. Photos.

F.H. Hinsley was formerly Master of St John's College and Professor of the History of International Relations at the University of Cambridge. He is the author of the four-volume history British Intelligence in the Second World War.
Alan Stripp is Director of Cambridge University Summer Schools on British Secret Services.

List of plates

xii

List of figures

xiii

Glossary and abbreviations

xiv

Introduction. The influence of Ultra in the Second World War

1

(14)

F. H. Hinsley

PART ONE. The production of Ultra intelligence

15

(66)

Life in and out of Hut 3

17

(13)

William Millward

The Duty Officer, Hut 3

30

(11)

Ralph Bennett

A naval officer in Hut 3

41

(9)

Edward Thomas

The Z Watch in Hut 4, Part I

50

(7)

Alec Dakin

The Z Watch in Hut 4, Part II

57

(4)

Walter Eytan

Italian naval decrypts

61

(7)

Patrick Wilkinson

Naval Section VI

68

(3)

Vivienne Alford

Anglo-American Signals intelligence co-operation

71

(3)

Telford Taylor

An American at Bletchley Park

74

(3)

Robert M. Slusser

Bletchley Park, the Admiralty, and naval Enigma

77

(4)

F. H. Hinsley

PART TWO. Enigma

81

(58)

The Enigma machine: Its mechanism and use

83

(6)

Alan Stripp

Hut 6: Early days

89

(11)

Stuart Milner-Barry

Hut 6: 1941-1945

100

(13)

Derek Taunt

Hut 8 and naval Enigma, Part I

113

(6)

Joan Murray

Hut 8 and naval Enigma, Part II

119

(4)

Rolf Noskwith

The Abwehr Enigma

123

(9)

Peter Twinn

The bombes

132

(7)

Diana Payne

PART THREE. Fish

139

(54)

An Introduction to Fish

141

(8)

F. H. Hinsley

Enigma and Fish

149

(18)

Jack Good

The Tunny machine

167

(8)

Ken Halton

Operation Tunny

175

(18)

Gil Hayward

PART FOUR. Field ciphers and tactical codes

193

(62)

Recollections of Bletchley Park, France, and Cairo

195

(14)

Henry Dryden

Army Ultra's Poor Relations

209

(22)

Noel Currer-Briggs

Navy Ultra's Poor Relations

231

(15)

Christopher Morris

Tactical signals of the German Air Force

246

(9)

Peter Gray Lucas

PART FIVE. Japanese codes

255

(51)

Japanese naval codes

257

(7)

Michael Loewe

Bedford-Bletchley-Kilindini-Colombo

264

(18)

Hugh Denham

Japanese military codes

282

(6)

Maurice Wiles

Japanese Army Air Force codes at Bletchley Park and Delhi

288

(12)

Alan Stripp

Recollections of temps perdu at Bletchley Park

300

(6)

Carmen Blacker

Appendix. How the Bletchley Park buildings took shape

306

(5)

Bob Watson

Index of codes, ciphers, and cryptanalysis

311

(2)

General index

313

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