// security
Caesar Cipher
Encrypt and decrypt text using Caesar cipher algorithm.
idle
113 (ROT13)25
original
ABCDEFGHIJKLMNOPQRSTUVWXYZ
shifted (+3)
DEFGHIJKLMNOPQRSTUVWXYZABC
letters 0
Encrypted text will appear here.
Enter text to brute-force all 25 shifts.
How it works
Each letter shifts a fixed number of positions: E(x) = (x + k) mod 26
Security
Only 25 keys — trivially broken by brute force or frequency analysis
ROT13
Shift of 13; applying it twice returns the original text
Examples
HELLO → KHOOR (shift 3) · HELLO → URYYB (ROT13)