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Atbash cipher

This calculator allows you to encrypt and decrypt text with Atbash method

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The rule of Atbash cipher is that you have to change n letter of alphabet with m − n + 1 letter, where m - the number of letter in an alphabet.
Here's an example
abcdefghijklmnopqrstuvwxyz (original text)
zyxwvutsrqponmlkjihgfedcba (cipher text)

PLANETCALC, Atbash cipher

Atbash cipher

Transformed text
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