Quote:
While I'm not a cryptanalyst,  I suggest you search the net for "chosen plaintext attack".
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I won't do this, but I will take your word for it that the encryption can be defeated with an appropriate tool.
That being the case, there's no defense short of server checking, and there's a lot of checking to do. The type and quantity of every asset a player apparently holds (gems, items, units etc) in the incoming 2h file has to be reconciled against the ftherlnd file, and that's not easy.