Fun with Secret Writing pdf epub mobi txt 電子書下載2025

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出版者:

作者:Lamb, Geoffrey

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頁數:60

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出版時間:2002-5

價格:$ 5.59

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isbn號碼:9780486420981

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Fascinating, easy-to-understand book for would-be cryptanalysts of all ages teaches how to invent and decipher a host of codes and secret messages, including the "Moving Ahead" cipher used by Julius Caesar; dots and pinpricks, as used by the secret Rosicrucian society; and even a system used by Sherlock Holmes. 14 black-and-white illustrations.