The test suite should check the size of the answer. It seems kind of a cheat to give an answer with 8 characters when the encrypted message has length 10. We can't be sure if the person found the asnwer for the two last characters or not.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
Remove the polynomials that have positive real elements of their roots.
Sorted highest to lowest?
Right and wrong
Return the first and last characters of a character array
Find the square of the sum of the digits of a number
Packing oranges - one layer
expand intervals vol.2
Modify subscripts - easier
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