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Cryptanalysis
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Preface General Information Concealment Devices Transposition Types Geometrical Types--The Nihilist Transposition Geometrical Types--The Turning Grille Irregular Types--Columnar Transposition "General Methods--Multiple Anagramming, Etc." Substitution Types Simple Substitution--Fundamentals The Consonant-Line Short Cut A Method for Attacking Difficult Cases (by George C. Lamb) Simple Substitution with Complexities Multiple-Alphabet Ciphers--The Vigenere "The Gronsfeld, Porta, and Beaufort Ciphers" The Kasiski Method for Periodic Ciphers Miscellaneous Phases of Vigenere Decryptment Auto-Encipherment Some Periodic Number-Ciphers Periodic Ciphers with Mixed Alphabets Polyalphabetical Encipherment Applied by Groups Vigenere with Key-Progression Polygram Substitution--The Playfair Cipher Highlights of Fractional Substitution Investigating the Unknown Cipher Appendix English Frequency and Sequence Data Comparative Table of Single-Letter Frequencies Chart Showing Normal Contact Percentages (by F.R. Carter) Chart Showing Frequencies of English Digrams (by O. Phelps Meaker) Some Foreign Language Data Bibliography (by W.D. Witt) The Commonest English Words (by Frank R. Fraprie) English Trigrams (by Frank R. Fraprie) English Digrams (by Frank R. Fraprie) Solutions Index

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