Titolo: Cryptanalysis: A Study of Ciphers and Their Solution (Dover Brain Games & Puzzles)
Editore: Dover Publications
Data di pubblicazione: 1989
Lingua: Inglese
ISBN 10: 0486200973
ISBN 13: 9780486200972
Rilegatura: Paperback
Condizione: Fair
Peso: 358 grammi

Descrizione articolo

Riassunto

Introduzione completa e sistematica alla crittografia seria, particolarmente valida nelle forme moderne di soluzione di cifratura utilizzate dagli esperti. Nichilista, griglia, esercito degli Stati Uniti, frase chiave, alfabeto multiplo, Gronsfeld, Porta, Beaufort, cifrari periodici e altro. Metodi semplici e avanzati. 166 campioni da risolvere ― con soluzioni.

Contenuti

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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