We seem to have an instinctive fascination for mysteries and, especially, for mysteries that revolve around secret codes. This penchant brought about a publishing sensation in 2003-Dan Brown's novel ...
1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...
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