Table of contents : MILITARY CRYPTANALYSIS Part IV......Page 0 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