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How to use Caesar Cipher

Type your text and set a shift amount, and the tool encodes or decodes it using the classic Caesar shift cipher.

Frequently asked questions

What is the Caesar cipher?

A substitution cipher where each letter is shifted N positions in the alphabet. ROT13 is Caesar shift 13.

How secure is the Caesar cipher?

Not secure at all — only 25 possible keys, easily broken by brute force or frequency analysis.

Can I brute force all 25 shifts?

Yes — the tool shows all 25 possible decodings at once in brute force mode.

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