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Atbash Cipher

Encode and decode text using the Atbash cipher.

Updated

What is the Atbash Cipher?

Atbash Cipher is a browser-based text transformer that mirrors letters across the alphabet, turning A into Z, B into Y, and so on. It works as both an encoder and decoder because the transform is self-inverse. [web:8][web:21]

This tool is useful for puzzle solving, cryptography practice, classroom demos, and quick text obfuscation. It keeps the workflow simple: paste text, choose your options, and instantly see the mirrored output. [web:1][web:2]

The Atbash cipher is one of the oldest known substitution ciphers and is strongly associated with ancient Hebrew writing traditions. Modern Atbash tools often preserve spaces and punctuation, which makes the output easier to read while still showing the cipher effect clearly. [web:19][web:22]

How it works

Atbash works by reversing the alphabet position of each letter. In the English alphabet, A maps to Z, B maps to Y, C maps to X, and the pattern continues until M and N meet in the middle. [web:8][web:25]

Because the mapping is symmetrical, the same operation is used for both encoding and decoding. If you apply Atbash twice to the same text, you get the original text back. That property is what makes the cipher self-inverse. [web:19][web:21]

This tool mirrors letters only and can optionally preserve or transform digits and non-letter characters depending on the selected mode. That matches common Atbash implementations that keep punctuation and spacing readable while transforming the alphabetic content. [web:2][web:22]

The tool also provides an alphabet reference table so users can verify each pair visually. This is especially helpful for learners who want to understand the substitution pattern instead of treating it like a black box. [web:1][web:24]

Examples

Encode a word

Mirror each letter across the alphabet while keeping punctuation intact.

HELLO
SVOOL

Decode a sentence

Apply the same Atbash transform again to recover the original text.

GSRH RH Z HVXIVG
THIS IS A SECRET

Keep symbols unchanged

Letters are mirrored while spaces, punctuation, and numbers remain readable.

Meet me at 7:30 PM!
Nvvg nv zg 7:30 KN!

Frequently asked questions

What is the Atbash cipher?

The Atbash cipher is a substitution cipher that mirrors the alphabet, so A becomes Z, B becomes Y, and so on. It is historically linked to ancient Hebrew writing and is also called a mirror cipher. [web:8][web:19]

Can Atbash decode text as well as encode it?

Yes. Atbash is self-inverse, which means the same transform is used for both encoding and decoding. Applying it twice returns the original text. [web:21][web:19]

Does the tool preserve spaces and punctuation?

Yes. This tool can keep symbols readable so the transformed output is easier to inspect in puzzles, practice exercises, or educational use. Common Atbash implementations leave numbers and punctuation untouched. [web:2][web:22]

Is Atbash secure?

No. Atbash is a simple classical cipher and is not considered secure for protecting sensitive information. It is best used for learning, puzzles, and light obfuscation. [web:19][web:24]

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