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Codes, Ciphers and Secret Writing
por Martin Gardner
Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
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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.
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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."
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