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... :)
given 3 sides, find area of this triangle
Increment a number, given its digits
Convert hex color specification to MATLAB RGB
Is the Point in a Circle?
Generate a NaN...on purpose
Optimum Egyptian Fractions
Don't Try, give up and return NaN.
Pernicious Anniversary Problem
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