MD5 and cryptographic hash functions in general have many uses - not least integrity checking and password storage. They have the property of
mixing the input in an unpredictable but
deterministic way. This can be very useful - and not just in security applications. Here are two great examples I came across recently:
partitioning users into groups for controlled experiments on the web, and
Dopplr's
colour-coding of cities. Neat.
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