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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.

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

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### Cryptanalysis Tools

 Function Analyze bigrams Permutations Brute-force Desubstitution with random grid (no permutation)

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.

### How to encrypt using ADFGX cipher

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.

### How to decrypt ADFGX cipher

The decryption process is identical to the ADFGVX cipher.

### How to recognize an ADFGX ciphered text?

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.

### How to recognize a non-permuted text?

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.

### How to decipher ADFGX without key for permutation?

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

### How to decipher ADFGX without grid

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.

### How to decipher ADFGX without key or grid?

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.

### When ADFGX have been used?

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.

### What is the GEDEFU 18?

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