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) : 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.

The decryption process is identical to the ADFGVX cipher.

The ciphertext 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 ciphertext 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.

To crack ADFGX without a key, there is no method other than the brute-force attack (test of all possible permutations).

The substitution grid can be found by performing an alphanumeric substitution of the bigrams resulting from the encrypted text after the permutations.

See the dCode tool for mono-alphabetic substitutions.

The decoding of ADFGX without any information is complicated, but it is possible to find the permutation key first (see above) and then to perform a mono-alphabetical substitution.

The 5 letters A, D, F, G and X have been selected due to their Morse code equivalent. Indeed, their transcriptions are quite different, which avoids possible errors during radio transmissions.

GEDEFU 18 stands for GEheimschrift DEr FUnker 18 which translates as **radiotelegraphists 18 cipher** is the old name of the ADFGX and ADFGVX ciphers.

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- Why the letters ADFGX?
- What is the GEDEFU 18?

adfgx,adfgvx,painvin,war,grid

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

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