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Codes, Ciphers and Secret Writing (Dover Children's Activity Books) [Paperback]
- Item No : 197582208323
- Condition : Brand New
- Brand : No brand Info
- Seller : shoppingmadeeasy2
- Current Bid : US $11.52
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* Item Description
- Cipher and decipher codes: transposition and polyalphabetical ciphers, famous codes, typewriter and telephone codes, codes that use playing cards, knots, and swizzle sticks . . . even invisible writing and sending messages through space. 45 diagrams. 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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