ROT13 Cipher Tool : Text Encryption and Decryption
Thinkforu.org ROT13 Cipher Tool
Encrypt and decrypt text using the ROT13 substitution cipher
ROT13 Reference Table
| Plain | A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cipher | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Plain | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cipher | A | B | C | D | E | F | G | H | I | J | K | L | M |
Examples & Usage Guide
Basic Text Encryption
Original: "HELLO WORLD"
ROT13: "URYYB JBEYQ"
Numbers and Special Characters
Original: "Hello, World 2023!"
ROT13: "Uryyb, Jbeyq 2023!"
Note: Numbers and special characters remain unchanged
Double ROT13
Original: "Secret Message"
First ROT13: "Frperg Zrffntr"
Second ROT13: "Secret Message"
Applying ROT13 twice returns the original text!
Frequently Asked Questions
What is ROT13?
ROT13 is a simple 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, with a shift of 13 places.
Why use ROT13?
ROT13 is often used to hide text from casual readers, such as hiding spoilers in online forums. It's not secure encryption and shouldn't be used for sensitive data. Its main advantage is that the same operation both encrypts and decrypts the text.
How does ROT13 handle non-letter characters?
ROT13 only affects letters A-Z and a-z. Numbers, punctuation, spaces, and special characters remain unchanged. This makes it easy to read the structure of the text while still obscuring the content.
Is ROT13 secure encryption?
No, ROT13 is not secure encryption. It's a simple substitution cipher meant for light obfuscation, not security. For sensitive data, use modern encryption standards like AES or RSA.