This book is a survey of cryptology, not a history book. However, any survey of cryptology should include or lead readers to discover for themselves at least a little history of the subject, as this book does, not just because of how the subject has been formed by its history, but also because the idea of writing secret messages has led to historical matters, both fictional (e.g., a cipher in a Sherlock Holmes mystery) and actual (e.g., encrypted messages sent by the Zodiac killer), that are (at least to us) inherently interesting. We have placed many of our historical references in exercises to prompt readers to search for this information themselves, because, this being a survey book rather than a history book, ...
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