SAN FRANCISCO — A piece to the puzzle in one of America’s most talked-about unsolved mysteries apparently fell into place as news surfaced Friday that a code in the Zodiac Killer case had been solved ...
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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