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"Substitution ciphers" as a book category groups works that focus on codes in which letters or symbols are systematically replaced by other letters, numbers, or signs. It includes instructional guides and textbooks that teach classical techniques (Caesar shifts, monoalphabetic and polyalphabetic ciphers, homophonic and Playfair variants) and practical cryptanalysis methods (frequency analysis, pattern recognition, key recovery), puzzle collections and activity books of enciphered messages for hobbyists, and narrative or historical titles that center on codebreaking episodes, espionage, or mysteries solved through substitution. These books are aimed at readers interested in learning encryption basics, sharpening logical and pattern-solving skills, exploring the history of secret writing, or enjoying cipher-based fiction and puzzles.

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