# Classical Ciphers

Classical ciphers are pre-computer methods of hiding messages by shifting, substituting or rearranging letters. ROT13 shifts each letter 13 places, so applying it twice gives back the original, and counting how often each letter appears can break a simple substitution cipher. These ciphers suit puzzles, escape rooms and teaching, but they do not protect real secrets.

## Tools

No tools are available here yet.

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