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£4.42
A fascinating, challenging book.
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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