Caesar Cipher Tool
Educational cipher encoder/decoder with brute-force analysis
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Cipher Wheel
💡 Type text above to see letters highlighted on the wheel!
How Caesar Cipher Works
The Caesar cipher is one of the simplest and oldest encryption techniques. It's a substitution cipher where each letter is shifted by a fixed number of positions in the alphabet.
Example with shift 3:
Original: HELLO
Encoded: KHOOR
H → K (shift +3)
E → H (shift +3)
L → O (shift +3)
Historical Context: Named after Julius Caesar, who used it to protect military messages. The cipher is easily broken with modern techniques, but it's excellent for learning cryptography basics.
ROT13: A special case with shift 13. Because the English alphabet has 26 letters, applying ROT13 twice returns the original text (13 + 13 = 26).
Brute Force Attack: Since there are only 25 possible shifts (shift 0 = no change), you can try all combinations to crack the cipher. This tool's brute force feature does exactly that!