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ROT Cipher

Tool to decrypt/encrypt by ROT. The code ROT for Rotation (which most common variant is Caesar Cipher) is the easiest shift-based encryption cipher.

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ROT Cipher -

Tag(s) : Substitution Cipher

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# ROT Cipher

## ROT-n Encoder

### How to encrypt using Rot cipher?

Rot-N/Rot cipher is a simple character substitution based on a shift/rotation of N letters in an alphabet. E.g. one letter is replaced by another (always the same) that is located further (exactly N letters further) in the alphabet.

This is the basis of the famous Caesar code and its many variants modifying the shift. The most popular variant is the ROT13 which has the advantage of being reversible with our 26 letters alphabet (the encryption or decryption operations are identical because 13 is half of 26).

 Plain Alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ Cipher AlphabetShift/Rotation of 1 BCDEFGHIJKLMNOPQRSTUVWXYZA Cipher AlphabetShift/Rotation of 2 CDEFGHIJKLMNOPQRSTUVWXYZAB ... ... Cipher AlphabetShift/Rotation of 13 NOPQRSTUVWXYZABCDEFGHIJKLM ... ...

Example: The message ROTATION coded on the alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ with an offset of N=13, gives the encrypted message EBGNGVBA.

### How to decrypt Rot cipher?

Deciphering Rot is very similar (or sometimes identical) to encryption, with a shift of the alphabet in the other direction.

From a message and an alphabet (or a supposed alphabet), it is possible to test all rotations by bruteforce (as many tests as there are characters in the alphabet) in order to find the plain message.

### What are rot variants?

A variant of Rot consists of modifying the alphabet used, which may be different from the 26 characters (A to Z).

Any shift can be considered:

ShiftNameRemarks
1Rot1/Rot-1Minimal shift of 1 letter
2Rot2/Rot-2
3Rot3/Rot-3Caesar Cipher (default usual shift)
4Rot4/Rot-4
5Rot5/Rot-5Reversible for the 10 digits
6Rot6/Rot-6
7Rot7/Rot-7
8Rot8/Rot-8
9Rot9/Rot-9
10Rot10/Rot-10
11Rot11/Rot-11
12Rot12/Rot-12
13Rot13/Rot-13Reversible for our 26-letter alphabet
14Rot14/Rot-14
15Rot15/Rot-15
16Rot16/Rot-16Reversible for base32 encoding
17Rot17/Rot-17
18Rot18/Rot-18Reversible for an alphanumeric alphabet of 36 characters (26 letters + 10 digits)
19Rot19/Rot-19
20Rot20/Rot-20
21Rot21/Rot-21
22Rot22/Rot-22
23Rot23/Rot-23
24Rot24/Rot-24
25Rot25/Rot-25Reverse 1 letter shift
26Rot26/Rot-26Identity transformation (no change) for our 26-letter alphabet
31Rot31/Rot-31Reversible for an case-sensitive alphanumeric 62-chars alphabet (26 uppercase + 26 lowercase + 10 digits)
32Rot32/Rot-32Reversible for base64 encoding
47Rot47/Rot-47Reversible for the 94 ASCII printable characters

## Source code

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## Need Help ?

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NB: for encrypted messages, test our automatic cipher identifier!