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Break the Code: Cryptography for Beginners (Dover Children’s Activity Books)

Amazon.com Price:  $4.94 (as of 12/05/2019 20:04 PST- Details)

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Description

No, it is not a message from outer space! Just read it backwards, starting from the base line, to discover what this specially coded message says. (The extra letter “X” at the beginning was once thrown in just to make the message a bit more mysterious.)
Codes have been used for centuries. Now, with the assistance of this entertaining book, you, too, will have the ability to decipher dozens of secret messages. Veteran cryptographer Bud Johnson not only describes the different techniques used in secret writing but also explains — clearly and simply — how to make and break six different kinds of codes: simple letter grouping, reverse trail, shift code, key word code, date shift code, and twisted path code. You can even learn techniques for creating your own confidential messages!
Cartoons by illustrator Larry Daste accompany the 51 practice messages, together with easy-to-follow instructions explaining each type of code and how to use it. There’s also a glossary defining common terms used by cryptographers, a sheet of reproducible graph paper for writing out messages, and a page of ready-made alphabets for shift and key word codes. And if all those funny drawings and helpful guidelines don’t seem to be enough that can assist you decode our secret messages, do not be disturbed. Solutions are included at the end of the book.

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