Cryptography by Laurence D. Smith (Paperback, 1955)

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Preface I. Secret Weapon No. 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.
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