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ROT-13 Cipher

Tool to decrypt/encrypt with rot13. ROT-13 cipher is a particular case of the Caesar cipher, where the shift is equal to 13, this allow the cipher to be reciprocal.

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ROT-13 Cipher -

Tag(s) : Cryptography, Substitution Cipher

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# ROT-13 Cipher

## ROT13 Encoder

Tool to decrypt/encrypt with rot13. ROT-13 cipher is a particular case of the Caesar cipher, where the shift is equal to 13, this allow the cipher to be reciprocal.

### How to encrypt using Rot-13?

Encryption with Rot-13 replaces a letter by another one placed 13 position after in the alphabet

Example: ABCDEFGHIJKLM
NOPQRSTUVWXYZ

Example: DCODE is crypted QPBQR with ROT-13

### How to decrypt Rot-13 cipher?

Rot-13 decryption is identical to encryption, due to the reciprocal substituting alphabet used:

Example: ABCDEFGHIJKLM
NOPQRSTUVWXYZ

Example: QPBQR becomes DCODE.

### How to recognize ROT-13 ciphertext?

Frequency analysis shows a shift of 13 letters. A message encoded by Rot13 has an index of coincidence similar to the language of the plain text.

### What are the variants of the Rot-13 cipher?

Rot-13 is in fact a Caesar cipher with a shift of 13. As this code only works with letters, it was proposed to use it with the Rot5 for numbers or the Rot47 for ASCII values.

### What is the particularity of ROT13 Cipher?

An offset of 13 allows the encryption to be reversible. The encryption and decryption method are identical. Applying 2 consecutive encryptions (2 shifts of 13) heads to find the original text.