ROT13 cipher

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Rot13 is a substitution cipher method used to encrypt text. The basic principle of Rot13 is to shift each letter of the alphabet by 13 positions. For example, the letter A becomes the letter N, the letter B becomes the letter O, and so on.

The encryption is reversible, so if you encrypt a text with Rot13, you can decrypt it by applying the same algorithm again. Rot13 is considered a very weak cipher and should not be used for secure communications.

ROT13 cipher example

Original Text: "How are you doing today?"

Encrypted Text in Rot13: "Ubj ner lbh qbvat gbqnl?"

To obtain this encrypted text, each letter has been shifted 13 positions in the alphabet. For instance, the letter H has been replaced with the letter U (which is 13 positions ahead in the alphabet), the letter I has been replaced with the letter V, and so on. If you apply the same method again to this encrypted text, you will obtain the original text.

See also

Cryptographic Calculators