Apply the Atbash substitution, which mirrors the alphabet so A becomes Z and B becomes Y. It has no key, so it offers no security at all and is studied for its history.
Show calculation steps
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How to use the Atbash Cipher
- Paste your text.
- Click "Apply Atbash" – the same operation reverses it.
Frequently asked questions
Where does Atbash come from?
From Hebrew scribal tradition, where the first letter of the alphabet is exchanged with the last, the second with the second-last, and so on. The name itself encodes the rule using the first, last, second and second-last Hebrew letters. Instances appear in the Book of Jeremiah.
Why is Atbash weaker even than Caesar?
Because it has no key at all. Caesar at least has 25 possible shifts; Atbash has exactly one fixed mapping, so recognising the cipher is the same as breaking it.
Is it self-inverse?
Yes. The mapping is a mirror, so applying it twice returns the original text.
