Cryptography: The Science of Secret Writing by Laurence Dwight Smith

Description: Cryptography: The Science of Secret Writing by Laurence Dwight SmithISBN: 9780486202471 Readers interested in secret writing will find Cryptography an excellent elementary introduction to this fascinating subject. Here is a concise and simple 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 Vigenere 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; an explanation of the Baconian Biliteral Cipher; frequency tables for English, French, German, Italian, and Spanish. Unabridged unaltered republication of the 1st (1943) edition). Paperbound. This book is in acceptable condition, with visible wear and tear to the cover and creases on the cover. The inside pages are in excellent condition, with no markings on the inside pages. The binding is in good condition. Percentage of the proceeds from the sale of this book go to charity.

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Location: Reston, Virginia

End Time: 2024-11-17T22:26:28.000Z

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