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... :)
Find the palindrome
How to add?
Return area of square
Alternately upper-lower case
Calculate the Damerau-Levenshtein distance between two strings.
Cut an orange
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