Extra: The Caesar cipher is just one type of substitution cipher. Look up some other types of substitution ciphers and try them out. Are they harder or easier to use and crack? Observations and ...

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Object Details Author Churchhouse, R. F Contents 1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes ...