Paperback (31 May 2013)
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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. Dover Original.
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| ISBN: | 9780486291468 |
| Publisher: | Dover Publications Inc. |
| Imprint: | Dover Publications |
| Pub date: | 31 May 2013 |
| DEWEY: | 652.8 |
| DEWEY edition: | 21 |
| Language: | English |
| Number of pages: | 71 |
| Weight: | 276g |
| Height: | 277mm |
| Width: | 214mm |
| Spine width: | 7mm |
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