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It can be shown as follows that decryption function is the inverse of the encryption function, Read more ...

Applying ROT13 to a piece of text merely requires examining its alphabetic characters and replacing each one by the letter 13 places further along in the alphabet, wrapping back to the beginning if necessary.


In theory, any transposition cipher can be viewed as a permutation cipher where E is equal to the length of the plaintext; this is too cumbersome a generalisation to use in actual practice, however.

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The value a must be chosen such that a and m are coprime.

Considering the specific case of encrypting messages in English (i.e.

It then uses modular arithmetic to transform the integer that each plaintext letter corresponds to into another integer that correspond to a ciphertext letter.

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