| Preface |
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xiii | |
| Editorial Notes |
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xiv | |
| Notes on Vocabulary |
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xiv | |
| List of Abbreviations |
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xv | |
| Cryptanalytic Significance of the Analysis of Tunny |
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xvii | |
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| Editors' Introduction |
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xxv | |
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| Statistics at Bletchley Park |
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lxxv | |
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| Biographies of Authors |
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ciii | |
| Notes on the Editors of the Present Volume |
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cvii | |
| List of Figures |
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cix | |
| General Report on Tunny, with emphasis on statistical methods |
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1 | (2) |
| Part 0 Preface |
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3 | (3) |
| Part 1 Introduction |
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6 | (16) |
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6 | (4) |
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11B The Tunny cipher machine |
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10 | (6) |
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16 | (2) |
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18 | (1) |
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19 | (3) |
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Chapter 12 Cryptographic Aspects |
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22 | (10) |
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22 | (1) |
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23 | (2) |
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12C Chi breaking and setting: Solution of Z = X + D |
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25 | (4) |
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12D Motor and psi breaking and setting: Solution of D = ψ' |
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29 | (1) |
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12E Methods involving key: Solution of Z = K + P, and K = X + ψ' |
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30 | (2) |
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32 | (3) |
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13A Explanation of the categories |
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32 | (1) |
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13B Counting and stepping machines |
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33 | (1) |
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34 | (1) |
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13D Miscellaneous simple machines |
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34 | (1) |
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35 | (4) |
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35 | (1) |
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14B The two sections in 1945 |
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36 | (1) |
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37 | (2) |
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Chapter 15 Some Historical Notes |
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39 | (4) |
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15A First stages in machine development |
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39 | (1) |
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15B Early organisation and difficulties |
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40 | (1) |
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40 | (3) |
| Part 2 Methods of Solution |
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Chapter 21 Some Probability Techniques |
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43 | (7) |
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Chapter 22 Statistical Foundations |
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50 | (30) |
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50 | (1) |
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51 | (1) |
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52 | (1) |
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53 | (3) |
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22E The sum of two streams |
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56 | (1) |
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57 | (2) |
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22G The plain language stream |
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59 | (10) |
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69 | (5) |
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74 | (1) |
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22K Sampling errors in alphabetical counts |
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74 | (1) |
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75 | (1) |
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22X The algebra of proportional bulges |
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76 | (2) |
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22Y The amount of evidence derived from a letter count |
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78 | (2) |
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Chapter 23 Machine Setting |
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80 | (30) |
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80 | (1) |
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81 | (1) |
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23C Weighing the evidence |
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82 | (2) |
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84 | (5) |
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23E X-setting with X 2limitation |
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89 | (2) |
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91 | (1) |
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92 | (1) |
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93 | (3) |
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23J Flogging the evidence |
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96 | (1) |
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96 | (2) |
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23L Statistical setting of the motor |
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98 | (3) |
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101 | (1) |
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102 | (1) |
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103 | (1) |
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23W Calculation of the odds of the best score in a x-setting run |
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103 | (1) |
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23X Theory of coalescence |
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104 | (1) |
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23Z History of machine setting |
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105 | (5) |
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110 | (29) |
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110 | (1) |
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24B Making and entering rectangles |
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111 | (5) |
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116 | (1) |
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24D Starts for converging rectangles |
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117 | (2) |
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24E Rectangle significance tests |
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119 | (2) |
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24F Conditional rectangle |
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121 | (1) |
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24G Some generalized rectangles |
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122 | (1) |
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24W Theory of convergence |
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123 | (4) |
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127 | (9) |
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24Y Other theory of rectangles |
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136 | (3) |
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Chapter 25 Chi-Breaking from Cipher |
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139 | (46) |
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25A The short wheel-breaking run |
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139 | (3) |
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25B Weighing the evidence |
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142 | (2) |
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25C General plan of wheel-breaking |
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144 | (2) |
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146 | (4) |
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25E Special methods for X2 limitation |
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150 | (2) |
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25F Special method for ab not = to 1/2 |
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152 | (1) |
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25G Wheel-breaking exhibits |
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152 | (28) |
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25W Derivation of formulae for the weighing of evidence |
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180 | (3) |
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25X The number of legal wheels |
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183 | (1) |
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25Y Proportional bulges relating to X2 |
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183 | (2) |
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Chapter 26 Wheel-Breaking from Key |
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185 | (34) |
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185 | (1) |
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185 | (6) |
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26C Hand counting for X2ψ'1 limitation |
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191 | (3) |
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26D Recognising the ψ repeat and numbering |
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194 | (1) |
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26E Hand counting on X2 key |
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194 | (1) |
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195 | (1) |
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26G Key work in the Newmanry |
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195 | (3) |
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26H General considerations |
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198 | (1) |
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198 | (15) |
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26X Key-breaking significance tests |
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213 | (2) |
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26Y Formulae used in key-breaking |
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215 | (4) |
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219 | (18) |
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219 | (1) |
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220 | (1) |
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27C German TP operating practices |
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221 | (1) |
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222 | (1) |
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27E Preparation of decode and cipher |
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223 | (1) |
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224 | (2) |
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27G Statistical technique: running on Robinson |
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226 | (5) |
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27H History of crib organisation |
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231 | (1) |
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231 | (1) |
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232 | (2) |
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234 | (3) |
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Chapter 28 Language Methods |
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237 | (25) |
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237 | (2) |
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239 | (5) |
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244 | (2) |
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28D Motor breaking and setting |
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246 | (5) |
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251 | (11) |
| Part 3 Organisation |
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Chapter 31 Mr Newman's Section |
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262 | (5) |
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262 | (1) |
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262 | (1) |
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263 | (1) |
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263 | (1) |
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264 | (1) |
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265 | (1) |
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265 | (1) |
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266 | (1) |
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Chapter 32 Organisation of the Testery |
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267 | (1) |
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268 | (1) |
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268 | (1) |
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268 | (1) |
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Chapter 34 Registration and Circulation |
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269 | (2) |
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Chapter 35 Tapemaking and Checking |
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271 | (4) |
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271 | (1) |
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271 | (1) |
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35C Checking and alteration of tapes |
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271 | (1) |
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35D Preparation of message tapes |
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272 | (1) |
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273 | (1) |
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35F Wheel tapes and test tapes |
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273 | (1) |
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274 | (1) |
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274 | (1) |
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Chapter 36 Chi-Breaking from Cipher |
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275 | (2) |
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36A History and resources |
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275 | (1) |
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36B Rectangles and chit cap runs |
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275 | (1) |
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276 | (1) |
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Chapter 37 Machine Setting Organisation |
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277 | (3) |
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Chapter 38 Wheel-Breaking from Key, Organisation |
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280 | (2) |
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Chapter 39 Language Methods |
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282 | (2) |
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282 | (1) |
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282 | (1) |
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283 | (1) |
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283 | (1) |
| Part 4 Early Methods and History |
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Chapter 41 The First Break |
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284 | (6) |
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284 | (1) |
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41B Tunny shown to be a letter subtractor |
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285 | (1) |
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285 | (1) |
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286 | (3) |
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289 | (1) |
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Chapter 42 Early Hand Methods |
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290 | (8) |
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42A First efforts at message setting |
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290 | (1) |
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42B Machine breaking for March 1942 |
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291 | (1) |
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42C Message setting for March 1942 |
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292 | (1) |
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293 | (1) |
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294 | (4) |
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Chapter 43 Testery Methods 1942-44 |
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298 | (7) |
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43A Breaking Tunny August-October 1942 |
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298 | (1) |
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298 | (2) |
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43C The pre-Newmanry QEP era |
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300 | (2) |
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43D The foundation of the Newmanry and after |
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302 | (3) |
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Chapter 44 Hand Statistical Methods |
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305 | (4) |
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44A Introduction of the QEP (QSN) system |
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305 | (1) |
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44B Setting - statistical methods |
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306 | (2) |
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44C Introduction of P5 limitation |
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308 | (1) |
| Part 5 Machines |
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309 | (3) |
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Chapter 52 Development of Robinson and Colossus |
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312 | (4) |
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316 | (20) |
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317 | (1) |
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317 | (1) |
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318 | (1) |
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319 | (1) |
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319 | (1) |
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320 | (1) |
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320 | (2) |
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322 | (1) |
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323 | (3) |
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326 | (2) |
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328 | (4) |
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53M Colossus rectangling gadgets |
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332 | (2) |
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334 | (1) |
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334 | (2) |
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336 | (10) |
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336 | (1) |
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54B How scores are exhibited |
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336 | (1) |
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54C Bedsteads and position counting |
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337 | (1) |
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338 | (2) |
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340 | (2) |
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54F Miscellaneous counter facilities |
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342 | (1) |
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343 | (1) |
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343 | (1) |
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54J Some Robinson plugging used operationally |
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344 | (2) |
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Chapter 55 Specialized Counting Machines |
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346 | (4) |
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346 | (1) |
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347 | (1) |
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348 | (2) |
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Chapter 56 Copying Machines |
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350 | (11) |
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350 | (1) |
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350 | (1) |
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350 | (1) |
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351 | (1) |
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351 | (1) |
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352 | (1) |
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352 | (3) |
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355 | (3) |
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56J Tunny and decoding machines |
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358 | (1) |
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56K The (Newmanry) Tunny machine |
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358 | (2) |
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360 | (1) |
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Chapter 57 Simple machines |
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361 | (1) |
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362 | (19) |
| Part 6 Raw Materials |
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Chapter 61 Raw Materials - Production, with Plans of Tunny Links |
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381 | (6) |
| Part 7 References |
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Chapter 71 Glossary and Index |
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387 | (48) |
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435 | (6) |
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441 | (3) |
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441 | (1) |
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441 | (1) |
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442 | (1) |
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73D Administration, standing orders, etc |
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442 | (1) |
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442 | (2) |
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444 | (8) |
| Part 8 Conclusions |
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452 | (4) |
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452 | (2) |
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454 | (1) |
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455 | (1) |
| Part 9 Appendices |
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Chapter 91 The 5202 Machine |
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456 | (15) |
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91A Principle of the 5202 |
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456 | (2) |
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458 | (6) |
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464 | (3) |
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467 | (1) |
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467 | (4) |
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Chapter 92 Recovery of Motor Patterns from De-chi |
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471 | (11) |
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92A Introduction and outline |
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471 | (1) |
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92B Decibanage of ΔD letters |
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472 | (1) |
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92C Construction of Motor Rectangle |
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473 | (1) |
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92D The Scoring of Columns against each other |
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473 | (1) |
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92E The Recovery of Patterns (A). Finding the dottage of µ61 |
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474 | (2) |
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92F The Recovery of Patterns (B). The approximate µ37 and µ41 |
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476 | (2) |
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92G Finishing off the µ's |
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478 | (1) |
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92H Recovery of the ψ patterns |
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479 | (1) |
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92I Example of method (b) |
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479 | (1) |
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92K Experiment in recovery by method of the smooth µ61 |
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479 | (3) |
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482 | (2) |
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Chapter 94 Research into the QEP System |
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484 | (4) |
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Chapter 95 Mechanical Flags |
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488 | (7) |
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488 | (1) |
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95B Mechanical ordinary flag |
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489 | (2) |
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95C Mechanical combined key flag |
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491 | (4) |
| Appendix A: Transmission of Teleprinter Signals |
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495 | (8) |
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| Appendix B: Activities at Knockholt |
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503 | (27) |
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| Appendix C: The 5202 Machine |
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530 | (5) |
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| Appendix D: Initial Conception of Colossus |
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535 | (5) |
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| Appendix E: List of Scanned Exhibits |
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540 | (2) |
| Supplementary Glossary |
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542 | (5) |
| Biographical Notes |
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547 | (14) |
| Notes |
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561 | (63) |
| Bibliography |
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624 | (21) |
| Index |
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645 | |
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