Reply To: Yet another 10B post

Harry, feel free to censor this, but does it have anything to do with the ADFGVX cipher even though it was made in 1918?

That is quite possible. If we are too pernickety about historical ciphers we would be restricting ourselves too much and making it far too easy for you! In any case, it could be to do with the ADFGVX cipher without actually being the ADFGVX cipher –  in this case it is actually very slightly weaker! Hope you enjoy figuring out why. Harry