The original of this document is held in the United Kingdom
at the National Archives, Kew, Richmond, Surrey, TW9 4DU
Reference HW 25/4 and HW 25/5


General Report on Tunny


GENERAL REPORT ON TUNNY
With Emphasis on Statistical Methods.


TABLE OF CONTENTS

Part 0
    01 Preface
 
Part 1     INTRODUCTION
    11 German Tunny
    12 Cryptographic Aspects
    13Machines
    14 Organisation
    15 Some Historical Notes
 
Part 2     METHODS OF SOLUTION
    21 Some Probability Techniques
    22 Statistical Foundations
    23 Machine Setting
    24 Rectangling
    25 Chi-breaking (from Cipher)
    26 Wheel-breaking (from Key)
    27 Cribs
    28 Language Methods
 
Part 3     ORGANISATION
    31 Mr. Newman's Section
    32 Major Tester's Section
    33 Knockholt
    34 Registration and Circulation
    35 Tape-making and Checking
    36 Chi-breaking and Cribs
    37 Machine Setting
    38 Wheel-breaking (from Key)
    39 Language Methods
 
Part 4     EARLY METHODS AND HISTORY
    41 The First Break
    42 Early Hand Methods
    43 Testery Methods 1942-4
    44 Hand Statistical Methods
 
Part 5     MACHINES
    51 General Introduction
    52 Development of Robinson and Colossus
    53 Colossus
    54 Robinson
    55 Specialised Counting Machines
    56 Copying Machines
    57 Simple Machines
    58 Photographs
(See also p332 in section 53)
Part 6
    61 Raw Materials and Production with Plans of Tunny Links
 
Part 7     REFERENCE
    71 Glossary and Index
    72 Notation
    73 Bibliography
    74 Chronology
 
Part 8
    81 Conclusions
 
Part 9     APPENDICES
    91 5202
    92 Motor Rectangles
    93 Thrasher
    94 QKP Research
    95 Mechanical Flags


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