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Elementary cryptanalysis

Helen Fouché Gaines

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APPENDIX BIBLIOGRAPHY By W. D. Witt INDEX Transcriber's Note

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Table of contents

1. Front matter 2. PREFACE 3. CHAPTER I General Information 4. CHAPTER II Concealment Devices 5. CHAPTER III Transposition Types 6. CHAPTER IV Geometrical Types — The Nihilist Transposition 7. CHAPTER V Geometrical Types — The Turning Grille 8. CHAPTER VI Irregular Types — Columnar Transposition 9. CHAPTER VII General Methods — Multiple Anagramming, Etc.10. CHAPTER VIII Substitution Types 11. CHAPTER IX Simple Substitution — Fundamentals 12. CHAPTER X The Consonant-Line Short Cut 13. CHAPTER XI Simple Substitution with Complexities 14. CHAPTER XII Multiple-Alphabet Ciphers — The Vigenère 15. CHAPTER XIII The Gronsfeld, Porta, and Beaufort Ciphers 16. CHAPTER XIV The Kasiski Method for Periodic Ciphers 17. CHAPTER XV Miscellaneous Phases of Vigenère Decryptment 18. CHAPTER XVI Auto-Encipherment 19. CHAPTER XVII Some Periodic Number-Ciphers 20. CHAPTER XVIII Periodic Ciphers with Mixed Alphabets 21. CHAPTER XIX Polyalphabetical Encipherment Applied by Groups 22. CHAPTER XX Vigenère with Key-Progression 23. CHAPTER XXI Polygram Substitution — The Playfair Cipher 24. CHAPTER XXII Highlights of Fractional Substitution 25. CHAPTER XXIII Investigating the Unknown Cipher 26. APPENDIX 27. BIBLIOGRAPHY By W. D. Witt 28. INDEX 29. Transcriber's Note

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