A letter can say one thing and mean something completely different.For centuries, that possibility mattered enormously. A messenger could be stopped. A ship car ...
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 ...
The Romans didn’t have cybersecurity teams, but they’d already figured out that readable messages could be a problem.
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