Reddit reviews Codes, Ciphers and Secret Writing (Dover Children's Activity Books)
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If you're looking for a book that teaches you about codes and practical codebreaking, here are two greats: Cryptanalysis: A Study of Ciphers and Their Solution, by Helen Fouché Gaines and Codes, Ciphers and Secret Writing, by Martin Gardner.
For a historical look try The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography, by Simon Singh. I really loved that one!