Thought about using SHA-1 hash as shorter version for comparison when storing browser fingerprints. Led me to some of these articles.
http://stackoverflow.com/questions/297960/hash-collision-what-are-the-chances
http://www.suspekt.org/2008/08/17/mt_srand-and-not-so-random-numbers/
http://en.wikipedia.org/wiki/Birthday_problem
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