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...I've copied and tested...it worked fine;)).

Uh..oh I've copied your Encryptor and surveyed it...have a question


int[] nums = numValues(toArray(enc));//array getting the exception
...
for(int i = 0; i < enc.length(); i++)

What happens...

the ind could be negative even you did ind *= -1;. Try with this:


int ind = (nums[i] + inc)*chng;//the index in vals[] containing the correct character
if(ind < 0) ind = math.abs(ind);...