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Encryption 2
Congratz about catching the letters. :) It isn't about shifting characters. It is rather about substitution chiper like it is mentioned in this nice article: https://www.hellboundhackers.org/articles/494-encryption-2.html If you get the idea you will be able to modify your code in the right way, so it isn't necessary to use PolyCrypt.
If you are still stucked, feel free to pm me. ;)