Cryptanalysis: a Study of Ciphers and Their Solution

Description

Cover; Title; Copyright; Dedication; PREFACE; Contents; I. GENERAL INFORMATION; II. CONCEALMENT DEVICES; III. TRANSPOSITION TYPES; IV. GEOMETRICAL TYPES- THE NIHILIST TRANSPOSITION; V. GEOMETRICAL TYPES- THE TURNING GRILLE; VI. IRREGULAR TYPES- COLUMNAR TRANSPOSITION .; VII. GENERAL METHODS- MULTIPLE ANAGRAMMING, ETC; VIII. SUBSTITUTION TYPES; IX. SIMPLE SUBSTITUTION- FUNDAMENTALS; X. THE CONSONANT-LINE SHORT CUT; A METHOD FOR ATTACKING DIFFICULT CASES (BY GEORGE C. LAMB); XI. SIMPLE SUBSTITUTION WITH COMPLEXITIES; XII. MULTIPLE-ALPHABET CIPHERS- THE VIGENèRE.;Thorough, systematic introduction to serious cryptography, especially strong in modern forms of cipher solution used by experts. Nihilist, grille, U.S. Army, key-phrase, multiple-alphabet, Gronsfeld, Porta, Beaufort, periodic ciphers, and more. Simple and advanced methods. 166 specimens to solve - with solutions. Cover Title Copyright Dedication PREFACE Contents I. GENERAL INFORMATION II. CONCEALMENT DEVICES III. TRANSPOSITION TYPES IV. GEOMETRICAL TYPES- THE NIHILIST TRANSPOSITION V. GEOMETRICAL TYPES- THE TURNING GRILLE VI. IRREGULAR TYPES- COLUMNAR TRANSPOSITION . VII. GENERAL METHODS- MULTIPLE ANAGRAMMING, ETC VIII. SUBSTITUTION TYPES IX. SIMPLE SUBSTITUTION- FUNDAMENTALS X. THE CONSONANT-LINE SHORT CUT A METHOD FOR ATTACKING DIFFICULT CASES (BY GEORGE C. LAMB) XI. SIMPLE SUBSTITUTION WITH COMPLEXITIES XII. MULTIPLE-ALPHABET CIPHERS- THE VIGENèRE. XIII. THE GRONSFELD, PORTA, AND BEAUFORT CIPHERSXIV. THE KASISKI METHOD FOR PERIODIC CIPHERS XV. MISCELLANEOUS PHASES OF VIGENèRE DECRYPTMENT XVI. AUTO-ENCIPHERMENT XVII. SOME PERIODIC NUMBER-CIPHERS XVIII. PERIODIC CIPHERS WITH MIXED ALPHABETS XIX. POLYALPHABETICAL ENCIPHERMENT APPLIED BY GROUPS XX. VIGENÈRE WITH KEY-PROGRESSION XXI. POLYGRAM SUBSTITUTION- THE PLAYFAIR CIPHER. XXII. HIGHLIGHTS OF FRACTIONAL SUBSTITUTION XXIII. 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.