Military Cryptanalysis

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
MULTHJTEUL 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  I’ilraXrtlpll......Page 596
ANALYTICAL KEY FOR MILITARY CRYPTANALYSIS, IV......Page 644
INDEX......Page 645