Codes and Secret Writing

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W. Morrow, 1948 - Ciphers - 154 pages
3 Reviews
Explains how to make and break several kinds of codes, how to use secret languages and how to make invisible inks.

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User Review  - tedosan - LibraryThing

Excerpt from the Author's Foreword: "... If I were a teacher of English, science or mathematics, I'd take advantage of the interest and satisfying activities that codes and secret writing offer ... Read full review

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User Review  - Wey-bey - LibraryThing

Excerpt from the Author's Foreword: "... If I were a teacher of English, science or mathematics, I'd take advantage of the interest and satisfying activities that codes and secret writing offer ... Read full review

Contents

CODES AND CIPHERS
1
THE FIRST AND SIMPLEST CODES
14
POSITION CODES
29
Copyright

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