Decrypted Secrets

Methods and Maxims of Cryptology

By: Friedrich L. Bauer

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Hardcover | 6 October 2006 | Edition Number 4

At a Glance

Hardcover
556 Pages

Edition Type
Revised

Dimensions(cm)
24.13 x 16.51 x 1.91

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In today's extensively wired and unsafe world cryptology plays a vital role in guarding communication channels, databases, and software from unwanted intruders. Increased processing and communications speed, rapidly broadening access and multiplying storage capacity tend to make systems less secure over time, and security becomes a race against the relentless creativity of the unscrupulous. The revised and extended third edition of this classic reference work on cryptology offers a wealth of new technical and biographical details. The first part reviews secret codes and their uses - the foundations of cryptography. The second part deals with the process of covertly decrypting a secret code - cryptanalysis, and gives particular advice on assessing methods. The book presupposes only elementary mathematical knowledge. Spiced with a wealth of exciting, amusing, and sometimes personal accounts from the history of cryptology, it will also interest general readers.

Industry Reviews

"The best single book on cryptology today." -- Cryptologia (from a review of a previous edition)

From the reviews of the fourth edition:

"This comprehensive updated edition is divided into two sections. The first part of the book deals with The People and the second concentrates on The Machinery. ... This volume includes 191 Figures, 29 Tables and 16 Color Plates, plus an Appendix. ... Friedrich L. Bauer Professor Emeritus of Mathematics and Computer Science ... has written an outstanding book on cryptology that belongs in your personal library or as a gift for a friend. ... There are other fascinating sidelights to this excellent book." (The Cryptogram, Page 15, 2007)

"By far the best single work on the subject." -- David Kahn

"It contains a wealth of material on the history of classical cryptology, focusing especially on the first half of the 20th century. ... The book is so thorough that it could serve as a textbook for those who want to develop their skills in this area. ... this book is an excellent source for the history of codemaking and codebreaking in the early and mid-20th century." (Neal Koblitz, SIAM Review, Vol. 52 (4), 2010)

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You Can Find This Book In

Non-Fiction Reference, Information & Interdisciplinary Subjects Interdisciplinary Studies Communication Studies Computing & I.T.Computer Security Data Encryption Language & Linguistics Linguistics Computational Linguistics Mathematics Number Theory

Computer Science Applied Mathematics Research & Information Coding Theory & Cryptology Information Technology General Issue Ethical & Social Aspects of IT

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Paperback

Published: 12th February 2010

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Cryptography-The People	p. 1
Introductory Synopsis	p. 9
Cryptography and Steganography	p. 9
Semagrams	p. 10
Open Code: Masking	p. 13
Cues	p. 17
Open Code: Veiling by Nulls	p. 19
Open Code: Veiling by Grilles	p. 23
Classification of Cryptographic Methods	p. 24
Aims and Methods of Cryptography	p. 26
The Nature of Cryptography	p. 26
Encryption	p. 32
Cryptosystems	p. 34
Polyphony	p. 36
Character Sets	p. 39
Keys	p. 41
Encryption Steps: Simple Substitution	p. 44
Case y[superscript (1) rightarrow] W (Unipartite Simple Substitutions)	p. 44
Special Case V [leftrightarrowr] V (Permutations)	p. 46
Case V[superscript (1) rightarrow] W[superscript m] (Multipartite Simple Substitutions)	p. 53
The General Case V[superscript (1) rightarrow] W[superscript (m)], Straddling	p. 55
Encryption Steps: Polygraphic Substitution and Coding	p. 58
Case V[superscript 2 rightarrow] W[superscript (m)] (Digraphic Substitutions)	p. 58
Special Cases of Playfair and Delastelle: Tomographic Methods	p. 64
Case V[superscript 3 rightarrow] W[superscript (m)] (Trigraphic Substitutions)	p. 68
The General Case V[superscript (n) rightarrow] W[superscript (m)]: Codes	p. 68
Encryption Steps: Linear Substitution	p. 80
Self-reciprocal Linear Substitutions	p. 82
Homogeneous Linear Substitutions	p. 82
Binary Linear Substitutions	p. 86
General Linear Substitutions	p. 86
Decomposed Linear Substitutions	p. 87
Decimated Alphabets	p. 90
Linear Substitutions with Decimal and Binary Numbers	p. 91
Encryption Steps: Transposition	p. 93
Simplest Methods	p. 93
Columnar Transpositions	p. 98
Anagrams	p. 102
Polyalphabetic Encryption: Families of Alphabets	p. 106
Iterated Substitutions	p. 106
Cyclically Shifted and Rotated Alphabets	p. 107
Rotor Crypto Machines	p. 110
Shifted Standard Alphabets: Vigenere and Beaufort	p. 127
Unrelated Alphabets	p. 131
Polyalphabetic Encryption: Keys	p. 139
Early Methods with Periodic Keys	p. 139
'Double Key'	p. 141
Vernam Encryption	p. 142
Quasi-nonperiodic Keys	p. 144
Machines that Generate Their Own Key Sequences	p. 145
Off-Line Forming of Key Sequences	p. 156
Nonperiodic Keys	p. 158
Individual, One-Time Keys	p. 161
Key Negotiation and Key Management	p. 165
Composition of Classes of Methods	p. 169
Group Property	p. 169
Superencryption	p. 171
Similarity of Encryption Methods	p. 173
Shannon's 'Pastry Dough Mixing'	p. 174
Confusion and Diffusion by Arithmetical Operations	p. 180
DES and IDEA	p. 184
Open Encryption Key Systems	p. 193
Symmetric and Asymmetric Encryption Methods	p. 194
One-Way Functions	p. 196
RSA Method	p. 203
Cryptanalytic Attack upon RSA	p. 205
Secrecy Versus Authentication	p. 208
Security of Public Key Systems	p. 210
Encryption Security	p. 211
Cryptographic Faults	p. 211
Maxims of Cryptology	p. 220
Shannon's Yardsticks	p. 225
Cryptology and Human Rights	p. 226
Cryptanalysis-The Machinery	p. 233
Exhausting Combinatorial Complexity	p. 237
Monoalphabetic Simple Encryptions	p. 238
Monoalphabetic Polygraphic Encryptions	p. 239
Polyalphabetic Encryptions	p. 241
General Remarks on Combinatorial Complexity	p. 244
Cryptanalysis by Exhaustion	p. 244
Unicity Distance	p. 246
Practical Execution of Exhaustion	p. 248
Mechanizing the Exhaustion	p. 251
Anatomy of Language: Patterns	p. 252
Invariance of Repetition Patterns	p. 252
Exclusion of Encryption Methods	p. 254
Pattern Finding	p. 255
Finding of Polygraphic Patterns	p. 259
The Method of the Probable Word	p. 259
Automatic Exhaustion of the Instantiations of a Pattern	p. 264
Pangrams	p. 266
Polyalphabetic Case: Probable Words	p. 268
Non-Coincidence Exhaustion of Probable Word Position	p. 268
Binary Non-Coincidence Exhaustion	p. 271
The De Viaris Attack	p. 272
Zig-Zag Exhaustion of Probable Word Position	p. 280
The Method of Isomorphs	p. 281
A clever brute force method: EINSing	p. 287
Covert Plaintext-Cryptotext Compromise	p. 288
Anatomy of Language: Frequencies	p. 290
Exclusion of Encryption Methods	p. 290
Invariance of Partitions	p. 291
Intuitive Method: Frequency Profile	p. 293
Frequency Ordering	p. 294
Cliques and Matching of Partitions	p. 297
Optimal Matching	p. 303
Frequency of Multigrams	p. 305
The Combined Method of Frequency Matching	p. 310
Frequency Matching for Polygraphic Substitutions	p. 316
Free-Style Methods	p. 317
Unicity Distance Revisited	p. 318
Kappa and Chi	p. 320
Definition and Invariance of Kappa	p. 320
Definition and Invariance of Chi	p. 323
The Kappa-Chi Theorem	p. 325
The Kappa-Phi Theorem	p. 326
Symmetric Functions of Character Frequencies	p. 328
Periodicity Examination	p. 330
The Kappa Test of Friedman	p. 331
Kappa Test for Multigrams	p. 332
Cryptanalysis by Machines: Searching for a period	p. 333
Kasiski Examination	p. 339
Building a Depth and Phi Test of Kullback	p. 345
Estimating the Period Length	p. 348
Alignment of Accompanying Alphabets	p. 350
Matching the Profile	p. 350
Aligning Against Known Alphabet	p. 354
Chi Test: Mutual Alignment of Accompanying Alphabets	p. 358
Reconstruction of the Primary Alphabet	p. 363
Kerckhoffs' Symmetry of Position	p. 365
Stripping off Superencryption: Difference Method	p. 370
Decryption of Code	p. 373
Reconstruction of the Password	p. 373
Compromises	p. 375
Kerckhoffs' Superimposition	p. 375
Superimposition for Encryptions with a Key Group	p. 377
Colossus	p. 401
Adjustment 'in depth' of Messages	p. 412
Cryptotext-Cryptotext Compromises	p. 419
Cryptotext-Cryptotext Compromise: ENIGMA Indicator Doubling	p. 431
Plaintext-Cryptotext Compromise: Feedback Cycle	p. 448
Linear Basis Analysis	p. 459
Reduction of Linear Polygraphic Substitutions	p. 459
Reconstruction of the Key	p. 460
Reconstruction of a Linear Shift Register	p. 461
Anagramming	p. 464
Transposition	p. 464
Double Columnar Transposition	p. 467
Multiple Anagramming	p. 467
Concluding Remarks	p. 470
Success in Breaking	p. 471
Mode of Operation of the Unauthorized Decryptor	p. 476
Illusory Security	p. 482
Importance of Cryptology	p. 484
Axiomatic Information Theory	p. 487
Bibliography	p. 497
Index	p. 501
Photo Credits	p. 525
Table of Contents provided by Ingram. All Rights Reserved.

Decrypted Secrets

Methods and Maxims of Cryptology

At a Glance

Hardcover

Industry Reviews

Shipping

How to return your order

Defective items

You Can Find This Book In

Other Editions and Formats

Paperback

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