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

[Diva Canto]

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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>
>   

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