Tool to decrypt/encrypt with the K7 (or K-7) code, a substitution cipher, whose name indicates to associate the letter K with the digit 7. K7 is the abbreviation of the french word 'Cassette'.
K7 Code - 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!
K7 Code
K7 Decoder
K7 Encoder
Answers to Questions (FAQ)
How to encrypt using K7 cipher?
K-Seven Encryption is a variant of A1Z26 alphabetical position cipher, but instead of associating A=1, the code uses K=7, and so on, L=8, M=9 etc.
Example: DCODE is coded 26.25.11.26.1
How to decrypt K7 cipher?
K-7 Decryption is also identical to A1Z26 alphabetical rank cipher (but still with K=7) and for more speed, it is necessary to list letter associations starting from 7=K.
How to recognize K7 code ciphertext?
The message is composed of numbers, usually between 1 and 26.
In theory, the message will have more 1 that represents the letter E by default.
Any reference to the French word Cassette (VHS tape) or the K-7 mountain is a clue.
What are the variants of the K7 code?
If K=7 is invariant how to number other letters can be different from one method to another. Numbers may be increasing (J=6,K=7,L=8) or decreasing J=8,K=7,L=6 and may become negative or calculated modulo 26.
Source code
dCode retains ownership of the "K7 Code" source code. Any algorithm for the "K7 Code" algorithm, applet or snippet or script (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or any "K7 Code" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) or any database download or API access for "K7 Code" or any other element are not public (except explicit open source licence like Creative Commons). Same with the download for offline use on PC, mobile, tablet, iPhone or Android app.
Reminder: dCode is an educational and teaching resource, accessible online for free and for everyone.
Cite dCode
The content of the page "K7 Code" and its results may be freely copied and reused, including for commercial purposes, provided that dCode.fr is cited as the source.
Exporting the results is free and can be done simply by clicking on the export icons ⤓ (.csv or .txt format) or ⧉ (copy and paste).
To cite dCode.fr on another website, use the link:
In a scientific article or book, the recommended bibliographic citation is: K7 Code on dCode.fr [online website], retrieved on 2025-04-16,
