Elementary cryptanalysisFront matterReading editionChapter navigation29 reading sectionsGo to chapterChoose a chapter…Front matterPREFACEChapter I · General InformationChapter II · Concealment DevicesChapter III · Transposition TypesChapter IV · Geometrical Types — The Nihilist TranspositionChapter V · Geometrical Types — The Turning GrilleChapter VI · Irregular Types — Columnar TranspositionChapter VII · General Methods — Multiple Anagramming, Etc.Chapter VIII · Substitution TypesChapter IX · Simple Substitution — FundamentalsChapter X · The Consonant-Line Short CutChapter XI · Simple Substitution with ComplexitiesChapter XII · Multiple-Alphabet Ciphers — The VigenèreChapter XIII · The Gronsfeld, Porta, and Beaufort CiphersChapter XIV · The Kasiski Method for Periodic CiphersChapter XV · Miscellaneous Phases of Vigenère DecryptmentChapter XVI · Auto-EnciphermentChapter XVII · Some Periodic Number-CiphersChapter XVIII · Periodic Ciphers with Mixed AlphabetsChapter XIX · Polyalphabetical Encipherment Applied by GroupsChapter XX · Vigenère with Key-ProgressionChapter XXI · Polygram Substitution — The Playfair CipherChapter XXII · Highlights of Fractional SubstitutionChapter XXIII · Investigating the Unknown CipherAPPENDIXBIBLIOGRAPHY By W. D. WittINDEXTranscriber's NoteBeginning of this editionNext chapter →PREFACEAll chapters and sections (29)Opening pagesFront matterOther sectionsPREFACEChapters1234567891011121314151617181920212223Other sectionsAPPENDIXBIBLIOGRAPHY By W. D. WittINDEXTranscriber's NoteHelen Fouché Gaines◇Originally published in 1939 by American Photographic Publishing Co.◇PREFACE →