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.
ROT Cipher - dCode
Tag(s) : Substitution Cipher
dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!
ROT Cipher
ROT Cipher Decoder
ROT-n Encoder
Answers to Questions (FAQ)
What is Rot cipher? (Definition)
Rot-N/Rot cipher (for Rotation) 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).
How to encrypt using Rot cipher?
The message is substituted with an alphabet having undergone a rotation of N:
| Plain Alphabet | ABCDEFGHIJKLMNOPQRSTUVWXYZ |
| 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 with 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:
| Shift | Name | Remarks |
|---|---|---|
| 1 | Rot1/Rot-1 | Minimal shift of 1 letter |
| 2 | Rot2/Rot-2 | |
| 3 | Rot3/Rot-3 | Caesar Cipher (default usual shift) |
| 4 | Rot4/Rot-4 | |
| 5 | Rot5/Rot-5 | Reversible for the 10 digits |
| 6 | Rot6/Rot-6 | |
| 7 | Rot7/Rot-7 | |
| 8 | Rot8/Rot-8 | |
| 9 | Rot9/Rot-9 | |
| 10 | Rot10/Rot-10 | |
| 11 | Rot11/Rot-11 | |
| 12 | Rot12/Rot-12 | |
| 13 | Rot13/Rot-13 | Reversible for our 26-letter alphabet |
| 14 | Rot14/Rot-14 | |
| 15 | Rot15/Rot-15 | |
| 16 | Rot16/Rot-16 | Reversible for base32 encoding |
| 17 | Rot17/Rot-17 | |
| 18 | Rot18/Rot-18 | Reversible for an alphanumeric alphabet of 36 characters (26 letters + 10 digits) |
| 19 | Rot19/Rot-19 | |
| 20 | Rot20/Rot-20 | |
| 21 | Rot21/Rot-21 | |
| 22 | Rot22/Rot-22 | |
| 23 | Rot23/Rot-23 | |
| 24 | Rot24/Rot-24 | |
| 25 | Rot25/Rot-25 | Reverse 1 letter shift |
| 26 | Rot26/Rot-26 | Identity transformation (no change) for our 26-letter alphabet |
| 31 | Rot31/Rot-31 | Reversible for an case-sensitive alphanumeric 62-chars alphabet (26 uppercase + 26 lowercase + 10 digits) |
| 32 | Rot32/Rot-32 | Reversible for base64 encoding |
| 47 | Rot47/Rot-47 | Reversible for the 94 ASCII printable characters |
Source code
dCode retains ownership of the online "ROT Cipher" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "ROT Cipher" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "ROT Cipher" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "ROT Cipher" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.
Need Help ?
Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!
Questions / Comments
Thanks to your feedback and relevant comments, dCode has developed the best 'ROT Cipher' tool, so feel free to write! Thank you!