Break the Code: Cryptography for Beginners (Dover Children's Activity Books) free ebook download
2/22/2017 11:12:07 AM
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Veteran cryptographer's simply and clearly written how-to book provides youngsters 8 and up with all the information needed to decipher 56 secret messages. Funny cartoons and easy-to-follow instructions explain how to break six different codes, including simple letter grouping, reverse trail, shift code, key word code, date shift code and twisted path code. Examples and solutions.
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