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The last day I saw an interesting abuse of hash functions.
In an application that processed strings, there was a part where it compared medium sized strings. Instead of using the in-built string comparison routine, they calculated the hash values of the strings and compared the hashes. Clever?
Wrong!
Finding the hash value (MD5 in this case) of a string is an expensive task. If you do not retain the hash values for future purposes, just compare the strings directly to know whether they are equal.
