Cryptography: The Science of Secret Writing

Smith, Laurence Dwight; Laurence Dwight Smith (Author)

ISBN 10: 048620247X / ISBN 13: 9780486202471

Editore: Dover Publications, Inc., New York, 1943

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164 pp. Solidly bound copy with moderate use. Occassional pencil markings on text. Stains on top and fore edges. Marks on front cover. Creased front cover.

Codice articolo 2ivDe0045

Dati bibliografici

• Titolo: Cryptography: The Science of Secret Writing
• Editore: Dover Publications, Inc., New York
• Data di pubblicazione: 1943
• Lingua: Inglese
• ISBN 10: 048620247X
• ISBN 13: 9780486202471
• Rilegatura: Trade Paperback
• Disegnatore: Menten Inc. (Cover Design)
• Condizione: Good
• Cataloghi dei venditori:
  • Language Studies, Linguistics, Phonetics, Speech
  • Academic, Scholarly, Research

Descrizione articolo

Riassunto

"Those who delight in puzzles can find much to ponder here." — Science News Letter
"Will be well received by anyone really interested in the subject." — Scientific Book Club Review
Readers interested in secret writing will find this book an excellent elementary explanation of transposition and substitution ciphers, codes, and their solutions. More than 150 problems provide practical application as well as tests of skill and ingenuity.
After a brief description of the history of secret writing, the reader is introduced to fundamental principles of ciphers — transposition and substitution — and given an understanding of the various methods of enciphering and deciphering secret messages. The author covers geometrical patterns, route transcription, columnar transposition, and other methods used in transposition; under substitution, he treats mixed cipher systems, single-alphabet and polyalphabetical substitution, mechanical devices, the Vigenère system, etc. A discussion of cryptanalysis leads the reader into 151 problems for which answers are provided at the end. Appendixes offer notes on enciphering Japanese; and explanation of the Baconian Biliteral Cipher; frequency tables for English, French, German, Italian, and Spanish.

Contenuti

Preface I. Secret Weapon No. One II. The History of Secret Writing III. Transposition Ciphers IV. Substitution Ciphers V. Codes Compared with Ciphers VI. Cryptanalysis Transposition Ciphers Informal Substitution Ciphers Formal Substitution Ciphers VII. Problems VIII. Solutions Appendices a. Some notes on the enciphering of Japanese b. The Baconian biliteral cipher c. Frequency tables d. Bibliography e. Definitions Index