Encode and decode text using ROT13, ROT47, and other Caesar ciphers.
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Each letter maps to the letter 13 positions ahead. A↔N, B↔O, C↔P, etc.
ROT13 is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. It's a special case of the Caesar cipher named after Julius Caesar who used similar ciphers for military communication.
ROT13 is a letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Since the alphabet has 26 letters, applying ROT13 twice returns the original text.
No, ROT13 is not secure encryption. It's easily broken and is mainly used for obfuscation (hiding spoilers, puzzle answers) rather than security. For real encryption, use modern algorithms like AES.
ROT5 rotates digits 0-9 by 5. ROT18 combines ROT13 for letters and ROT5 for numbers. ROT47 rotates all printable ASCII characters (33-126) by 47, providing more obfuscation.
ROT13 is its own inverse because the alphabet has 26 letters, and 13 + 13 = 26. So encoding and decoding use the same operation - just apply ROT13 again to decode.