Tool to decrypt/encrypt ADFGX. ADFGX is a German encryption system, an old version of ADFGVX cipher, which uses a 5x5 square grid and a double mechanism of substitution then transposition.

ADFGX Cipher - dCode

Tag(s) : Cryptography,Substitution Cipher,Transposition Cipher

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Tool to decrypt/encrypt ADFGX. ADFGX is a German encryption system, an old version of ADFGVX cipher, which uses a 5x5 square grid and a double mechanism of substitution then transposition.

Encryption is identical to the ADFGVX cipher, but it only uses 5 letters: A, D, F, G and X and so only a 5x5 grid.

As there is only 25 possible letters in the grid, one letter of the latin alphabet has to be removed, usually J and I are combined, it can also be V and W.

The decryption process is identical to the ADFGVX cipher.

The ciphered text should contains only 5 distinct characters: A, D, F, G and X.

(Optional) The ciphered message must have number of character divisible by the permutation length.

If the ciphered text has not be permuted, the text is a simple bigrammic substitution. After a replacement by a random alphabet, the text should have an index of coincidence similar to the one of the plaintext language.

One can crack ADFGX and find the permutation order without knowing the key by bruteforcing all possible permutation.

One can crack ADFGX and find the substitution grid by making a simple alphanumeric replacement of the bigrams resulting from the permutations. Use dCode's tool for mono-alphabetical substitution.

One can crack ADFGX without the key nor the grid by finding the permutation (see below) and then perform an alphabetical substitution.

The letters A, D, F, G and X have been selected because their equivalent translation in morse code are very distinguishable, this prevents radio transmission errors.

ADFGX cipher have been introduces at the end of the first World War (from 1917). It has been used on the 5th of march 1918 during the german attack of Paris.

GEDEFU 18 for GEheimschrift DEr FUnker 18, which can be translated in radio-operators' cipher 18 is the old name of ADFGX cipher.

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- How to encrypt using ADFGX cipher
- How to decrypt ADFGX cipher
- How to recognize an ADFGX ciphered text?
- How to recognize a non-permuted text?
- How to decipher ADFGX without key for permutation?
- How to decipher ADFGX without grid
- How to decipher ADFGX without key or grid?
- Why the letters ADFGX?
- When ADFGX have been used?
- What is the GEDEFU 18?

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Source : http://www.dcode.fr/adfgx-cipher

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