Created by the Germans during World War I, the ADFGX cipher uses only five letters — A, D, F, G, and X. It’s based in a five-by-five grid.
It works kind of like Battleship - if you have ever played that game! The first letter of the sequence referring to the column down and the second letter referring to the row across. So... DF would equal M and FX would equal H.
Using that code, the word SPY would appear like this:
DG AD AA
Notice that the letters I and J appear in the same box. This is because there is only 25 boxes available, and 26 letters in the alphabet! However, the letter J does not get used very often, thus the code is still quite easy to decipher with the key.
Now you try it! (Answer below)
XX GA AG FG AF AF FX FG FA XX FA XX FD
Since some letters appear more frequently than others in words, the ADFGX cipher would have been pretty easy to crack if the same grid was used for weeks at a time.
However, the Germans changed the letter locations in the grid every day, making it more difficult to decipher intercepted messages.
Answer: (TI DID OHW WONK I)
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