ADFGVX Cipher is a transposition and substitution cipher used during World War I by the German Army. The name "ADFGVX" comes from the six possible letters used in the cipher: A, D, F, G, V, and X.
The ADFGX Cipher is a fractionating transposition cipher which combined a modified Polybius square with a single columnar transposition. It is closely related to the ADFGVX Cipher.