Atbash Cipher
Free Atbash cipher encoder. Mirror the alphabet: A=Z, B=Y, and so on.
About Atbash Cipher
Atbash is a monoalphabetic substitution cipher that mirrors the alphabet. It originated from Hebrew cipher traditions and is named after the first two letters of the Hebrew alphabet (aleph-taw-beth-shin). A becomes Z, B becomes Y, C becomes X, and so on through the entire alphabet.
How It Works
The alphabet is simply reversed: A↔Z, B↔Y, C↔X, D↔W, E↔V, F↔U, G↔T, H↔S, I↔R, J↔Q, K↔P, L↔O, M↔N. The same process reverses to decode.
Common Uses
- Puzzles and cryptography education
- Historical interest in Hebrew ciphers
- Simple text obfuscation
- Creative writing and secret codes
Atbash Chart
| Plain | Atbash |
|---|---|
| ABCDEFGHIJ | JIHGFEDCBA |
| KLMNOPQRST | TSRQPONMLK |
| UVWXYZ | ZYXWVU |
FAQ
Is Atbash secure?
No, like Caesar cipher, it can be easily broken by frequency analysis or by simply trying all 25 possible substitution ciphers.
Where does the name Atbash come from?
The name comes from Hebrew, where the first letter aleph is swapped with the last letter taw, and the second letter beth with the second-to-last letter shin.
How do you decode Atbash?
Apply the same Atbash transformation. A becomes Z, so Z decodes to A.