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Codes, Ciphers and Secret Writing (Dover Children's Activity Books) [Paperback]

Martin Gardner
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RRP: 6.99
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Table of Contents

Introduction 1. Easy Transposition Ciphers 2. Easy Substitution Ciphers 3. How to Break Substitution Ciphers 4. Hard-to-break Polyalphabetic Ciphers 5. Simple Code Machines 6. Invisible Writing 7. Bizarre Methods of Message Sending 8. Codes for Other Worlds References for Further Reading

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