Code and ciphers: Julius Caesar, the Enigma and the internet

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R. F. Churchhouse Codes and ciphers Julius Caesar, the Enigma and the internet
Page 2 and 3: This page intentionally left blank
Page 6 and 7: published by the press syndicate of
Page 8 and 9: vi contents 4 Jigsawciphers 40 Tran
Page 10 and 11: viii contents Thekeydistributionpro
Page 12 and 13: x preface It is the author’s beli
Page 14 and 15: 2 chapter 1 buy or sell a large num
Page 16 and 17: 4 chapter 1 Cryptography is the stu
Page 18 and 19: 6 chapter 1 Historically, two basic
Page 20 and 21: 8 chapter 1 messages will depend on
Page 22 and 23: 10 chapter 1 designed systems of th
Page 24 and 25: 12 chapter 1 not occasionally women
Page 26 and 27: 14 chapter 2 Table 2.1 Shift Messag
Page 28 and 29: 16 chapter 2 None of these look ver
Page 30 and 31: 18 chapter 2 which is written in ma
Page 32 and 33: 20 chapter 2 (2) Since Y, with 49 o
Page 34 and 35: 22 chapter 2 15 16 17 18 19 20 21 2
Page 36 and 37: 24 chapter 2 help or a hindrance to
Page 38 and 39: 26 chapter 2 How many letters are n
Page 40 and 41: 3 Polyalphabetic systems Strengthen
Page 42 and 43: 30 chapter 3 A Vigenère cipher is
Page 44 and 45: 32 chapter 3 Table 3.1 Letter ABCDE
Page 46 and 47: 34 chapter 3 Thus in the example ab
Page 48 and 49: 36 chapter 3 Message 1 and message
Page 50 and 51: 38 chapter 3 would typically be bet
Page 52 and 53: 4 Jigsaw ciphers In this chapter we
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42 chapter 4 Cryptanalytic attack S
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44 chapter 4 Likewise the second ci
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46 chapter 4 and 1 and 2 are 9 plac
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48 chapter 4 and the cipher text is
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50 chapter 4 (iii) Use a hexagon. I
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52 chapter 4 double transposition s
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5 Two-letter ciphers It may seem na
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56 chapter 5 headed ‘1’, which
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58 chapter 5 French cryptanalyst, G
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60 chapter 5 The Playfair square is
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62 chapter 5 Playfair system as the
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6 Codes Characteristics of codes As
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66 chapter 6 major factor in Americ
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68 chapter 6 before, to remind ours
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70 chapter 6 The sequence beginning
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7 Ciphers for spies A spy operating
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74 chapter 7 have been underlined i
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76 chapter 7 We first convert the t
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78 chapter 7 Table 7.3 Decipher tab
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80 chapter 7 Table 7.4 Letter frequ
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82 chapter 7 There are a few plausi
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84 chapter 7 We now turn our attent
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86 chapter 7 been enciphered using
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88 chapter 7 From CT2: (cipher�ke
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90 chapter 7 The message was again
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92 chapter 7 Table 7.7 6 1 10 4 8 1
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8 Producing random numbers and lett
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96 chapter 8 the spin, the sequence
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98 chapter 8 signal which is used t
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100 chapter 8 If we replace each te
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102 chapter 8 To take an easily ver
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104 chapter 8 Cryptanalysis of a li
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106 chapter 8 machines have been bu
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108 chapter 8 multiplier built into
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9 The Enigma cipher machine Histori
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112 chapter 9 The original Enigma T
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114 chapter 9 Plate 9.2 The other s
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116 chapter 9 Plate 9.4 The Enigma
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118 chapter 9 The ‘dots’ indica
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120 chapter 9 This plethora of subs
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122 chapter 9 acquired a military-v
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124 chapter 9 Figure 9. 3. B P K I
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126 chapter 9 H) and (C, Q) are suc
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128 chapter 9 Ironically, if the ci
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130 chapter 9 Table 9.3 Setting 1 S
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132 chapter 9 Doubly enciphered Eni
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134 chapter 10 so that there is rec
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136 chapter 10 Plate 10.1 A Hagelin
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138 chapter 10 Note that the 19- an
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140 chapter 10 Table 10.2 Encipher/
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142 chapter 10 (a) 0, 2, 3, 4, 8, 1
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144 chapter 10 7-Wheel 5 0 5 5 0 0
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146 chapter 10 combinations of the
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148 chapter 10 the numerical value
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150 chapter 10 comparing the two te
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152 chapter 10 corresponding to an
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154 chapter 11 Plate 11.1 An SZ42 c
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156 chapter 11 in many books such a
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158 chapter 11 Solution Plaintext l
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160 chapter 11 The third of these w
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162 chapter 12 as finding if the bi
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164 chapter 12 eight-bit) character
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166 chapter 12 one or more keys whi
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168 chapter 12 so 29 3 �29�15
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13 Encipherment and the internet Ge
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172 chapter 13 The opposite problem
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174 chapter 13 Fermat’s ‘Little
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176 chapter 13 should, in this case
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178 chapter 13 so 1�7�2�3 but
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180 chapter 13 Finally then (214) 1
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182 chapter 13 How does the key-own
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184 chapter 13 (6) Forty-eight bits
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186 chapter 13 Chaining Since the D
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188 chapter 13 (4) the session key
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Appendix Mathematical aspects Chapt
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192 appendix Suppose that we have a
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194 appendix Discussion of the Fibo
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196 appendix and, since all random
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198 appendix The ratio of consecuti
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200 appendix Solution A linear recu
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202 appendix Verification If such a
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204 appendix wires must give rise t
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206 appendix Putting N�26 we obta
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208 appendix The extreme values of
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210 appendix (2) In using modular a
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212 appendix For the RSA encipherme
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214 appendix so but so Hence 1�6
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216 appendix So, for example, the p
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Solutions to problems Chapter 2 2.1
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220 solutions to problems Chapter 4
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222 solutions to problems Table S.3
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228 solutions to problems The solut
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References Chapter 1 [1.1] Hill, R.
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232 references [6.7] Almost any ele
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234 references [12.8] Rabin, M.O.:
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236 name index Piper, F. 233 Poe, E
Page 250 and 251:
238 subject index computers early 1
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240 subject index polyalphabetic sy
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