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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

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ROT Cipher Decoder



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ROT-n Encoder










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.

Answers to Questions

How to encrypt using Rot cipher?

Rot-N/Rot cipher is a simple character substitution based on a shift (or rotation) of an alphabet. E.g. one letter is replaced by another (always the same) that is located 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 a 26 letter alphabet (the encryption or decryption operations are identical because 13 is half of 26).

Plain AlphabetABCDEFGHIJKLMNOPQRSTUVWXYZ
Cipher Alphabet
Shift/Rotation of 1
BCDEFGHIJKLMNOPQRSTUVWXYZA
Cipher Alphabet
Shift/Rotation of 2
CDEFGHIJKLMNOPQRSTUVWXYZAB
......
Cipher Alphabet
Shift/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.

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-25
26Rot26/Rot-26Identity transformation (no change) for our 26-letter alphabet
31Rot31/Rot-31Reversible for an case-sentitive 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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Questions / Comments


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