[Opensim-users] [Opensim-dev] Grid Numberging

[Stefan Andersson]

And the whole thread started with suggesting we allocate information bits to encode semantics. Which drastically heightens the risk of collisions, intentional or malicious.
Just see guids as private to the trust domain, and we'll all fine. Grids should be publicly referred to by something riches, as an uri/url for example.
Best regards,Stefan AnderssonTribal Media AB Join the 3d web revolution : http://tribalnet.se/ 



Date: Fri, 31 Oct 2008 20:10:41 -0700From: diva at metaverseink.comTo: opensim-users at lists.berlios.deSubject: Re: [Opensim-users] [Opensim-dev] Grid Numberging
Not to mention the dudes and dudettes who generate region UUIDs by hand... (a-hem)Purely random UUIDs that don't encode higher-order information are too fragile when there is a chance that people will get their hands on them. I'm not even talking about malicious manipulation, just simple human intervention.Frisby, Adam wrote: 
Yeah, the reason I said 'almost' wasn’t because of a good UUID generator, - it's the bad ones.

IE, people using bad random sources, etc which dramatically increase the chance of a collision - ie if you are only getting 30 bits of randomness, you could run into a collision fairly quickly.

Adam

  
-----Original Message-----
From: opensim-users-bounces at lists.berlios.de [mailto:opensim-users-
bounces at lists.berlios.de] On Behalf Of Sean Dague
Sent: Friday, 31 October 2008 4:48 PM
To: opensim-users at lists.berlios.de
Subject: Re: [Opensim-users] [Opensim-dev] Grid Numberging

Dr Scofield wrote:
    
Frisby, Adam wrote:
      
Shouldn’t UUIDs by definition be unique?



IE – if your generating them randomly a collision is almost
guaranteed to never ever occur.
        "almost" being a key word here...
      "...after generating 1 billion UUIDs every second for the next 100
years, the probability of creating just one duplicate would be about
50%. The probability of one duplicate would be about 50% if every
person on earth owns 600 million UUIDs."

http://en.wikipedia.org/wiki/Uuid

Just to keep "almost" in perspective,

        -Sean

--
Sean Dague / Neas Bade
sdague at gmail.com
http://dague.net

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