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Subject: Re: [cti-stix] Deterministic IDs - pas de deux

On 10.05.2016 18:02:36, Taylor, Marlon wrote:
> What enforces the UUIDv4 that "identifies" Object A is not used to
> identify Object B?

Hey, Marlon -

It's enforced by math. According to Wikipedia [0], the probability of
a UUIDv4 collision is approximately 0.00000000006. In other words,
"only after generating 1 billion UUIDs every second for the next 100
years, the probability of creating just one duplicate would be about
50%." [0].

Add to that the namespace prefix and the probability of a collision
decreases dramatically.

[0]: https://en.wikipedia.org/wiki/Universally_unique_identifier#Random_UUID_probability_of_duplicates

Trey Darley
Senior Security Engineer
4DAA 0A88 34BC 27C9 FD2B  A97E D3C6 5C74 0FB7 E430
Soltra | An FS-ISAC & DTCC Company
"One size never fits all." --RFC 1925

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