GUIDs are globally unique, but substrings of GUIDs aren’t

The GUID generation algorithm relies on the fact that it has all 16 bytes to use to establish uniqueness, and if you throw away half of it, you lose the uniqueness. There are multiple GUID generation algorithms, but I’ll pick one of them for concreteness, specifically the version described in the internet draft below.

See: http://blogs.msdn.com/b/oldnewthing/archive/2008/06/27/8659071.aspx

Draft: http://www.webdav.org/specs/draft-leach-uuids-guids-01.txt

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About luuksluijter

Be yourself, enjoy life, respect those arround you and appreciate whatever comes on your way.
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