AtBash cipher

The AtBash cipher (from Hebrew אתבש AtBash) is a simple monoalphabetic substitution cipher of Hebrew origin, which works by replacing the letter lying at a distance of X from the beginning of the alphabet to a letter lying at a distance of X from its end. The first letter of the alphabet is substituted for the last letter of the alphabet, the second for the pass, for the third for the third from the end, etc.

It was probably developed around 500 B.C.

The name of the cipher comes from the way it works. The first letter of the Hebrew alphabet is Aleph, the second - Beth, the penultimate - Shin, and the last - Taw. The name AtBash means that the first letter of the alphabet (Aleph) is replaced with the last (Taw), and the second (Beth) with the penultimate (Shin).

In order to decrypt the text encrypted with this cipher, it is enough to re-encrypt it.

To make manual operations on this cipher easier, just use the table.

Code table used in our coder:

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
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

The Atbash cipher can be implemented as affine cipher, by setting 'a' and 'b' to 26.

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AtBash cipher - online encoder / decoder

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