Atbash Cipher
Reverse the alphabet — A↔Z, B↔Y, C↔X. The same key encrypts and decrypts.
Output
Substitution Table
| Plain | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Cipher | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I | H | G | F | E | D | C | B | A |
How the Atbash Cipher Works
The Atbash cipher is one of the oldest known ciphers — each letter is replaced by the letter at the opposite end of the alphabet: A→Z, B→Y, and so on. Because it is its own inverse, the same operation both encrypts and decrypts. Non-alphabetic characters (spaces, numbers, punctuation) are left unchanged.
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