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"In reality the usable space is substantially less; you can start seeing significant collisions once you've filled half the space, but half of an impossibly large number is still impossibly large." Actually, thanks to the birthday paradox, you can expect to see a collision after using the square root of the number of valid identifiers, and the page you linked to even says as much. You've made a common mistake: 2^64 is not half of 2^128.
Commented Apr 6, 2012 on
Hashes are a bit like fingerprints for data. A given hash uniquely represents a file, or any arbitrary collection of data. At least in theory. This is a 128-bit MD5 hash you're looking at above, so it can represent at most 2128 unique items, or 340 trillion trillion trillion. In reality the...
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