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Re: [TSVN] Impact of GUID change?

From: SteveKing <steveking_at_gmx.ch>
Date: 2005-01-07 20:19:23 CET

Will Dean wrote:
> Well, I didn't believe you, because I had a quote of Larry Osterman
> (sp?) saying that the new GUI algorithm was just an MD5 hash of the
> old-style GUID.

Never heard of that. But if you read about how hashes are built, you
will discover that a hash has to be as random as possible (not in the
sense that a hash of something will change, but if you change one byte
of the source the result hash has to be as random as possible from the
previous hash). Ok, not a very mathematical description, but I hope you
get the point.

> But not really believing anyone, I've just stepped through UuidCreate,
> and it does indeed just generate a pseudo-random number (I'm not sure
> how it seeds this).
> So I'll concede, your pseudo random numbers are probably just as good as
> anyone else's!

I've just read that in several places in the MS newsgroups that the
GUIDs are created randomly. Not sure how exactly it is done though.


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Received on Fri Jan 7 20:19:55 2005

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