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Friedrich L. Bauer, ?Decrypted Secrets: Methods and Maxims of Cryptology?



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In today's unsafe and increasingly wired world cryptology plays a vital role in protecting communication channels, databases, and software from unwanted intruders. This revised and extended third edition of the classic reference work on cryptology now contains many new technical and biographical details. The first part treats secret codes and their uses - cryptography. The second part deals with the process of covertly decrypting a secret code - cryptanalysis, where particular advice on assessing methods is given. The book presupposes only elementary mathematical knowledge. Spiced with a wealth of exciting, amusing, and sometimes personal stories from the history of cryptology, it will also interest general readers.

Written for:

Scientists, students and practitioners in applied mathematics, computer science and information technology, and the general reader

Table of Contents

Part I: Cryptography The People 1 (232)

1 Introductory Synopsis 9 (17)

1.1 Cryptography and Steganography 9 (1)

1.2 Semagrams 10 (3)

1.3 Open Code: Masking 13 (4)

1.4 Cues 17 (2)

1.5 Open Code: Veiling by Nulls 19 (4)

1.6 Open Code: Veiling by Grilles 23 (1)

1.7 Classification of Cryptographic 24 (2)

Methods

2 Aims and Methods of Cryptography 26 (18)

2.1 The Nature of Cryptography 26 (6)

2.2 Encryption 32 (2)

2.3 Cryptosystems 34 (2)

2.4 Polyphony 36 (3)

2.5 Character Sets 39 (2)

2.6 Keys 41 (3)

3 Encryption Steps: Simple Substitution 44 (14)

3.1 Case V(?)- W (Unipartite Simple 44 (2)

Substitutions)

3.2 Special Case V & 091;-> V (Permutations) 46 (7)

3.3 Case V(?)- Wm (Multipartite Simple 53 (2)

Substitutions)

3.4 The General Case V(?0 - W(m) , 55 (3)

Straddling

4 Encryption Steps: Polygraphic 58 (22)

Substitution and Coding

4.1 Case V? -W(m) (Digraphic 58 (6)

Substitutions)

4.2 Special Cases of Playfair and 64 (4)

Delastelle: Tomographic Methods

4.3 Case V? -W(m) (Trigraphic 68 (1)

Substitutions)

4.4 The General Case V(n) - W(m) : 68 (12)

Codes

5 Encryption Steps: Linear Substitution 80 (13)

5.1 Self-reciprocal Linear Substitutions 82 (1)

5.2 Homogeneous Linear Substitutions 82 (4)

5.3 Binary Linear Substitutions 86 (1)

5.4 General Linear Substitutions 86 (1)

5.5 Decomposed Linear Substitutions 87 (3)

5.6 Decimated Alphabets 90 (1)

5.7 Linear Substitutions with Decimal and 91 (2)

Binary Numbers

6 Encryption Steps: Transposition 93 (13)

6.1 Simplest Methods 93 (5)

6.2 Columnar Transpositions 98 (4)

6.3 Anagrams 102(4)

7 Polyalphabetic Encryption: Families of 106(33)

Alphabets

7.1 Iterated Substitutions 106(1)

7.2 Cyclically Shifted and Rotated 107(3)

Alphabets

7.3 Rotor Crypto Machines 110(17)

7.4 Shifted Standard Alphabets: Vigen

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