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• PrefaceGeneral InformationConcealment DevicesTransposition TypesGeometrical Types--The Nihilist TranspositionGeometrical Types--The Turning GrilleIrregular Types--Columnar Transposition"General Methods--Multiple Anagramming, Etc."Substitution TypesSimple Substitution--FundamentalsThe Consonant-Line Short CutA Method for Attacking Difficult Cases (by George C. Lamb)Simple Substitution with ComplexitiesMultiple-Alphabet Ciphers--The Vigenere"The Gronsfeld, Porta, and Beaufort Ciphers"The Kasiski Method for Periodic CiphersMiscellaneous Phases of Vigenere DecryptmentAuto-EnciphermentSome Periodic Number-CiphersPeriodic Ciphers with Mixed AlphabetsPolyalphabetical Encipherment Applied by GroupsVigenere with Key-ProgressionPolygram Substitution--The Playfair CipherHighlights of Fractional SubstitutionInvestigating the Unknown CipherAppendixEnglish Frequency and Sequence DataComparative Table of Single-Letter FrequenciesChart Showing Normal Contact Percentages (by F.R. Carter)Chart Showing Frequencies of English Digrams (by O. Phelps Meaker)Some Foreign Language DataBibliography (by W.D. Witt)The Commonest English Words (by Frank R. Fraprie)English Trigrams (by Frank R. Fraprie)English Digrams (by Frank R. Fraprie)SolutionsIndex

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• PrefaceGeneral InformationConcealment DevicesTransposition TypesGeometrical Types--The Nihilist TranspositionGeometrical Types--The Turning GrilleIrregular Types--Columnar Transposition"General Methods--Multiple Anagramming, Etc."Substitution TypesSimple Substitution--FundamentalsThe Consonant-Line Short CutA Method for Attacking Difficult Cases (by George C. Lamb)Simple Substitution with ComplexitiesMultiple-Alphabet Ciphers--The Vigenere"The Gronsfeld, Porta, and Beaufort Ciphers"The Kasiski Method for Periodic CiphersMiscellaneous Phases of Vigenere DecryptmentAuto-EnciphermentSome Periodic Number-CiphersPeriodic Ciphers with Mixed AlphabetsPolyalphabetical Encipherment Applied by GroupsVigenere with Key-ProgressionPolygram Substitution--The Playfair CipherHighlights of Fractional SubstitutionInvestigating the Unknown CipherAppendixEnglish Frequency and Sequence DataComparative Table of Single-Letter FrequenciesChart Showing Normal Contact Percentages (by F.R. Carter)Chart Showing Frequencies of English Digrams (by O. Phelps Meaker)Some Foreign Language DataBibliography (by W.D. Witt)The Commonest English Words (by Frank R. Fraprie)English Trigrams (by Frank R. Fraprie)English Digrams (by Frank R. Fraprie)SolutionsIndex

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• PrefaceGeneral InformationConcealment DevicesTransposition TypesGeometrical Types--The Nihilist TranspositionGeometrical Types--The Turning GrilleIrregular Types--Columnar Transposition"General Methods--Multiple Anagramming, Etc."Substitution TypesSimple Substitution--FundamentalsThe Consonant-Line Short CutA Method for Attacking Difficult Cases (by George C. Lamb)Simple Substitution with ComplexitiesMultiple-Alphabet Ciphers--The Vigenere"The Gronsfeld, Porta, and Beaufort Ciphers"The Kasiski Method for Periodic CiphersMiscellaneous Phases of Vigenere DecryptmentAuto-EnciphermentSome Periodic Number-CiphersPeriodic Ciphers with Mixed AlphabetsPolyalphabetical Encipherment Applied by GroupsVigenere with Key-ProgressionPolygram Substitution--The Playfair CipherHighlights of Fractional SubstitutionInvestigating the Unknown CipherAppendixEnglish Frequency and Sequence DataComparative Table of Single-Letter FrequenciesChart Showing Normal Contact Percentages (by F.R. Carter)Chart Showing Frequencies of English Digrams (by O. Phelps Meaker)Some Foreign Language DataBibliography (by W.D. Witt)The Commonest English Words (by Frank R. Fraprie)English Trigrams (by Frank R. Fraprie)English Digrams (by Frank R. Fraprie)SolutionsIndex