Caesar Cipher Encryption
Encrypt or decrypt text using the Caesar cipher. Adjust the shift (1–25), use ROT13 with one click, or brute-force all 25 possible shifts at once.
Characters: 0 | Words: 0 | Lines: 0
EXAMPLE — ROT3 (classic Caesar)
Input: Hello World
ROT3: Khoor Zruog
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About the Caesar Cipher
The Caesar cipher is a substitution cipher in which each letter is replaced by a letter a fixed number of positions further along the alphabet. Julius Caesar reportedly used a shift of 3 to protect military communications.
Encryption example (shift 3)
- A → D, B → E, C → F …
- "Hello" → "Khoor"
- To decrypt: shift by −3 (or equivalently +23)
Is it secure?
No. With only 25 possible keys, it is trivially broken by brute force or frequency analysis. It is used today for educational purposes, puzzles, and CTF (Capture The Flag) competitions.