Cryptography: The Science of Secret Writing
Courier Corporation, 1955 - 164 páginas
"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.
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THE HISTORY OF SECRET WRITING
B THE BACONIAN BILITERAL CIPHER
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Acrostics American appears arranged beginning breaking century cipher alphabet cipher text Clue column common complete cryptanalysis cryptogram cryptography deciphering designs detailed device digraphs disarranged discussion disks easily enciphering encipherment enemy English equivalent error example fact figures four frequency geometrical given gives groups illustrations important indicated inscribed Japanese key word language letters in normal MATHEMATICAL means method military normal order Nulls occurs offers pattern photographs phrases plain text position possible practical present principle problems PUZZLES reader rectangle remaining letters reverse route secret selection sequence simple single square stories substitution taht tion transcribed translation transposition trigraphs turn units variations vertically Vigenère weakness writing written