An edition of Codes and Ciphers: Julius Caesar, the Enigma, and the Internet
(2001)
Codes and ciphers
Julius Caesar, the Enigma, and the internet
by R. F. Churchhouse
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Ciphers, CryptographyShowing 3 featured editions. View all 3 editions?
| Edition | Availability |
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1
Codes and ciphers: Julius Caesar, the Enigma, and the internet
2002, Cambridge University Press
in English
052181054X 9780521810548
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2
Codes and Ciphers: Julius Caesar, the Enigma, and the Internet
December 24, 2001, Cambridge University Press
Paperback
in English
0521008905 9780521008907
|
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WorldCat
|
3
Codes and Ciphers: Julius Caesar, the Enigma, and the Internet
December 24, 2001, Cambridge University Press
Hardcover
in English
052181054X 9780521810548
|
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WorldCat
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Book Details
Table of Contents
Machine generated contents note: 1 Introduction 1
Some aspects of secure communication I
Julius Caesar's cipher 2
Some basic definitions 3
Three stages to decryption identification, breaking and setting 4
Codes and ciphers 5
Assessing the strength ofa ciphersystem 7
Error detecting and correcting codes 8
Other methods of concealing messages 9
Ivlodulararithmetic 10
Modular addition and subtraction ofletters 11
Gender 11
End matter 12
Z FromJuliusCaesar tosimplesubstitution 13
Julius Caesarciphers and theirsolution 13
Simplesubstitutionciphers 15
How to solve a simple substitution cipher 17
Letter frequencies in languages other thanEnglish 24
How many letters are needed to solve a simple substitution cipher? 26
3 Polyalphabeticsystems 28
StrengtheningJulius Caesar Vigentre ciphers 28
HowtosolveaVigenirecipher 30
Indicators 33
Depths 34
Recognising'depths' 34
How much text do we need to solveaVigenere cpher? 37
Jefferson's cylinder 37
4 Jigsaw ciphers 40
Transpositions 40
Simple transposition 40
Doubletransposition 44
Other forms oftransposition 48
Assessment of the security of transposition ciphers 51
Double encipherment in general 52
5 Two-letterciphers 54
Monograph to digraph 54
MDTM ciphers 56
Digraph to digraph 58
Playfair encipherment 59
Playfair decipherment 60
Cryptanaytic aspects of Playfair 61
DoublePlayfair 61
6 Codes 64
Characteristics of codes 64
Onepartand to-part codes 65
Codeplusadditive 67
7 Ciphersforspies 72
Stencil ciphers 73
Book ciphers 75
Letter frequencies in book ciphers 79
Solving a book cipher 79
Indicators 86
Disastrous errors in using a book cipher 86
'GAito"sd phers 88
One-time pad 92
8 Produciingrandomnumbersandletters 94
Random sequences 94
Producing random sequences 95
Coin spinning 95
Throwingdice 96
Lotterytype draws 97
Cosmic rays 97
Amplifier noise 97
Pseudo-random sequences 98
Linear recurrences 99
Using a binary stream ofkey for endpherment 100
Binarylinarsequences as key generators 101
Cryptanalysisofa linear recurrence 104
Improving the security of biary keys 104
Pseudo-randomnumbergenerators 106
The mid-square method 106
Linearcongruential generators 107
9 TheEnigmaciphermachine 110
Historicalbackground 110
TheoriginalEnigma 112
Encipherment using wired wheels 116
EnciphermentbytheEnigma 118
The Enigmaplugboard 121
TheAchilles heelof the Enigma 121
The indicator 'chains' in the Enigma 125
Aligningthe chains 128
Identifying RI and its setting 128
Doublyenciphered Enigma messages 132
TheAbwehr Enigma 132
10 TheHagelinciphermachine 133
Historical background 133
Structureofthellagelinmachine 134
Enciphermentonthe Hagelin 135
Choosing the cage for the Hagelin 138
The theoretical 'work factofo' fortheHagein 142
Solving the Hagelin from a stretch of ke 143
Additional featursof rheHagelin machine 147
Theslide 147
Idenrifying the slide in a cipher message 148
Overlapping 148
solving the Hagelin from cipher texts only 150
11 BeyondtheEnigmia 153
TheSZ42: a pre-electronic machine 153
Description of the 742 machine 155
EnciphermentontheSZ42 t55
Breakingandsettingthe5Z42 158
Modifications tothe SZ42 159
12 Publickeycryptography 161
Historicalbackground 161
Securityissues 163
Protection ofprogramsand data 163
Encipherment of programs, dataand messages 164
The key distribution problem 166
The Difie-Hellman key exchange system 166
Strength of the Diffie-Hellman system 168
13 Encipherment and the internet 170
Generalisation of simple substitution 170
Factorisation of large integers 171
The standard method of factorisation 172
Fermat's'itde Theorem' 174
The Fermat-Euler Theorem (as needed in theRSA sstem) 175
Enciphermen and decipherment keys in the RSA system 175
The encipherment and decipherment processes in the RSA sysem 178
How does the key-owner reply tocorrespondents? 182
The Data Encryption Standard (DES) 183
Security of te DES 184
Chaining 186
Implementation of the DES 186
Using both RSA and DES 186
A salutary note 187
Beyond dteDES 187
Authentication and signature verification 188
Ellipticcurvecryptography 189
Appendix 190
Solutions to problems 218
References 230
Name index 235
Subject index 237.
Edition Notes
Includes bibliographical references and indexes.
Classifications
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