Cryptanalysis ; a study of ciphers and their solution

Content: 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.