تحلیل رمزنگاری نظامی، بخش چهارم: سیستم‌های جابجایی و تفکیک (سری رمزنگاری، شماره ۶۱)

This book provides an excellent foundation for solving cipher systems. The text describes the fundamental principles of cipher solution plus use of the unilateral frequency distribution in the solution process is covered in some detail. Various unilateral and multilateral systems are carefully discussed. In addition, the text introduces the student to the solution of digraphic substitution ciphers, including the solution of the Playfair Cipher. Numerous problems are provided for solution by the student. With New Added Problems For The Student......Page 1 FOREWORD......Page 4 MILITARY CRYPTANALYSIS, PART I. MONOALPHABETIC SUBSTITUTION SYSTEMS......Page 5 INTRODUCTORY REMARKS......Page 6 FUNDAMENTAL PRINCIPLES......Page 12 FREQUENCY DISTBIBUTIONS......Page 16 FUNDAMENTAL USES OF THE UNILITERAL FREQUENCY DISTRIBUTION......Page 23 UNILITERAL SUBSTITUTION WITH STANDARD CIPHER ALPHABETS......Page 32 UNILITERAL SUBSTITUTION WITH MIXED CIPHER ALPHABETS......Page 45 MULTILITERAL SUBSTITUTION WITH SINGLE-EQUIVALENT CIPHER ALPHARETS......Page 64 MULTILITERAL SUBSTITUTION WITH MULTIPLE-EQUIVALENT CIPHER......Page 68 POLYGRAPHIC SUBSTITUTION SYSTEMS......Page 75 CONCLUDING REMARKS......Page 104 APPENDIX I......Page 110 INDEX......Page 141 PROBLEMS......Page 147 BOOKS IN TEH CRYPTOGRAPHIC SERIES......Page 154 With Added PROBLEMS and COMPUTER PROGRAMS......Page 155 FOREWORD......Page 159 POLYALPHABETIC SUBSTITUTION SYSTEMS......Page 160 INTRODUCTORY REMARKS......Page 161 CIPHER ALPHABETS FOB POLYALPHABETIC SUBSTITUTION......Page 164 THEORY OF SOLUTION OF REPEATING-KEY SYSTEMS......Page 170 REPEATING-KEY SYSTEMS WITH STANDARD CIPHER ALPHABETS......Page 177 REPEATING-KEY SYSTEMS WITH MIXED CIPHER ALPHABETS, I......Page 184 REPEATING-KEY SYSTEMS WITH MIXED CIPHER ALPHABETS, II......Page 209 THEORY OF INDIRECT SYMMETRY OF POSITION IN SECONDARY ALPHABETS......Page 212 APPLICATION OF PRINCIPLES OF INDIRECT SYMMETRY OF POSITION......Page 220 REPEATING-KEY SYSTEMS WITH MIXED CIPHER ALPHABETS,III......Page 238 BEPEATING-KEY SYSTEMS WITH MIXED CIPEEB ALPHABETS, IV......Page 244 Analytical Key for Military Cryptanalysis, Part II *......Page 255 THE 12 TYPES oF CIPHER SQUARES......Page 256 ELEMENTARY STATISTICAL THEOEY APPLICABLE TO TFIE PHENOMENA OB REPETITION......Page 268 A GRAPHICAL METHOD OF RECONSTRUCTING PRIMARY COMPONENTS BY......Page 281 INDEX......Page 292 PROBLEMS......Page 294 COMPUTER PROGRAMS......Page 308 INDEX OF PROGRAMS......Page 309 Vigenere Encipherment......Page 310 TRUE BEAUFORT ENCIPHERMENT......Page 312 VARIANT BEAUFORT ENCIPHERMENT......Page 314 DETERMINING THE PERIOD OF A PERIODIC CIPHER......Page 316 VIGENERE ENCIPHERMENT USING MIXED ALPHABETS......Page 318 MILITARY CRYPTANALYSIS PART Ill......Page 321 INTRODUCTORY......Page 326 SECTION II......Page 330 SOLUTION OF SYSTEMS USING CONSTANT-LENGTH KEYING UNITS TO ENCIPHER......Page 339 SECTION III......Page 333 SOLUTION OF SYSTEMS USING VARIABLE-LENGTH KEYING UNITS TO ENCIPHER......Page 344 REVIEW OF AUTO-KEY SYSTEMS......Page 353 SOLUTION OF CIPHER-TEXT AUTO-KEY SYSTEMS......Page 355 SOLUTION OF PLAIN-TEXT AUTO-KEY SYSTEMS......Page 370 METHODS OF LENGTHENING OR EXTENDING THE KEY......Page 375 GENERAL PRINCIPLES UNDERLYING SOLUTION OF SYSTEMS EMPLOYING LONG......Page 378 THE COINCIDENCE OR x TEST......Page 383 THE CROSS-PRODUCT SUM OR x TEST......Page 398 APPLYING THE CROSS-PRODUCT SUM OR x TEST......Page 404 THE MONOALPHABETICITY OR + TEST......Page 419 CONCLUDING REMARKS......Page 422 APPENDIX 1......Page 423 INDEX......Page 442 Analytical Key for Military Cryptanalysis, Part IlI......Page 444 BOOKS IN THE CRYPTOGRAPHIC SERIES......Page 445 Transposition and Fractionating Systems......Page 446 GENERAL......Page 452 SOLUTION OF SIMPLE TRANSPOSITION CIPHERS......Page 454 INCOMPLETELY-FILLED RECTANGLES......Page 469 OPPORTUNITIES AFFORDED BY STUDYING ERRORS AND BLUNDERS MADE BY ENEMY CRYPTOGRAPHERS......Page 488 SPECIAL SOLUTIONS FOR TRANSPOSITION CIPHERS......Page 491 PRINCIPLES OF MATRIX RECONSTRUCTION......Page 531 SOLUTION OF GRILLES......Page 537 COMBINED SUBSTITUTIOX-TRANSPOSITION SYSTEMS......Page 546 SOLUTION OF THE ADFGVX SYSTEM......Page 549 SOLUTION OF BIFID FRACTIONATING SYSTEMS IilraXrtlpll......Page 596 ANALYTICAL KEY FOR MILITARY CRYPTANALYSIS, IV......Page 644 INDEX......Page 645 This book, now declassified by the U.S. Government, contains heretofore unpublished methods for solving transposition cipher systems. The solution of grille systems, combined substitution-transposition systems, the ADFGVX System, and the bifid fractionating systems are described in detail. This is an advanced text written in clear terms for the serious cryptanalyst. Analytical key and index are included. Important information not found elsewhere is contained in this book.