Tool to decrypt/encrypt with the D3 code. D-3 is a substitution cipher system whose principle is to associate the letter D with the digit 3. D3 is the abbreviation of the french city/word 'Detroit'.

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!

D-Three Encryption is a particular variant of the A1Z26 (alphabetical rank), but rather than using A=1, the code selects D=3, and the other letters follow the same logic, E=4, F=5 etc.

Example:DCODE is coded 3/2/14/3/4

How to decrypt D3 cipher?

D-3 Decryption associates to each numbers a unique letter (defined during the encryption process according to selected association along with 3=D). (See variants)

How to recognize D3 ciphertext?

A message coded with D3 is composed of numbers, theoretically between 1 and 26, and most probably, the digit 4 of letter E will be more represented.

Any reference to the city of Detroit, Gibraltar, or any strait (détroit in French) is a clue.

What are the variants of the D3 code?

Since D=3 remains invariant, only the way of writing the other letters can change, according to increasing numbers C=2,D=3,E=4 or decreasing C=4,D=3,E=2 even, use negative numbers if necessary (via calculations modulo 26).

Source code

dCode retains ownership of the online "D3 Code" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "D3 Code" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "D3 Code" 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 "D3 Code" 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 'D3 Code' tool, so feel free to write! Thank you!

Thanks to your feedback and relevant comments, dCode has developed the best 'D3 Code' tool, so feel free to write! Thank you!