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Decryption of Rot5 is identical to the encryption because Rot5 is reversible.

6789012345 1234567890

Example:793 re-becomes 248 by ROT-5

How to recognize ROT-5 ciphertext?

ROT-5 converter is used on the digits. Numbers that began with 1 now begin with 6, the 2s become 7s etc. The shifting by 5 continues so on.

According to Benford's law, there should be more 6 than 4 among the first digits of the numbers in the ciphertext.

What are the variants of the Rot-5 cipher?

Rot-5 is already a variant of Rot13, itself a version of Caesar cipher with a shift of 13. Rot-5 is therefore a Caesar cipher with a shift of 5, but applied to an alphabet of digits.

It is common to associate a ROT-13 for coding the letters and ROT-5 for the numbers at the same time.

What a shift of 5 for Rot5?

A shift of 5 allows the code to be reciprocal/reversible/symmetric, this means that 2 consecutive encryptions lead to find the plain number.

Source code

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