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Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.

Codes, Ciphers, & Secret Writing 1973, Pocket Books

ISBN-13: 9780671299545

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Codes, Ciphers, and Secret Writing 1972, Simon & Schuster, New York, NY

ISBN-13: 9780671652012

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