Grade 9 UpAA thorough introduction to the history of cryptology that explains
the fundamental concepts of this science. Newton provides concise,
easy-to-read definitions of terms, topics, and personalities pertinent to
the history of encoded messages. Entries are arranged alphabetically and often include
cross-references and suggestions for further reading. Black-and-white illustrations,
photographs, and charts assist in the comprehension of terms.
While there are many books aimed at certain aspects of this topic,
none of them do as good a job of presenting a comprehensive yet accessible
overview of secret-message writing throughout ancient and modern times.

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Interesting post......