Tool to decrypt/encrypt with the K6 code. K-6 is a substitution cipher whose principle is in its name: associating the letter K with the digit 6. K6 is the abbreviation of the french city/word 'Cassis'.
K6 Code - dCode
Tag(s) : Substitution Cipher
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K6 Code
K6 Decoder
K6 Encoder
Answers to Questions (FAQ)
How to encrypt using K6 cipher?
K-Six Encryption is a particular case of the A1Z26 alphabetical rank cipher, but rather than associating A=1, the code uses K=6 and so on: L=7,M=8 etc.
Example: DCODE is coded 25/24/10/25/26
How to decrypt K6 cipher?
K-6 Decryption associates to numbers a letter (it's the opposite of encryption) and requires to know letters-numbers association other than 6=K (often 7=L,8=M etc.)
How to recognize K6 ciphertext?
A K6 coded message is composed of numbers, often between 1 and 26, and often there is a lot of 26 representing the letter E.
Any reference to the French city of Cassis, the fruit of the cassissier, or the mountain K6 are clues.
What are the variants of the K6 code?
If K=6 is an invariant, the way to give a number to the other 25 letters can differ. Numbers may be increasing (J=5,K=6,L=7) or decreasing J=7,K=6,L=5 and may become negative or calculated modulo 26.
Source code
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Cite as source (bibliography):
K6 Code on dCode.fr [online website], retrieved on 2023-12-05,
