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Co-authored-by: qarnax <47157066+qarnax801@users.noreply.github.com>
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Corbin Crutchley
2023-01-14 18:03:36 -08:00
committed by GitHub
parent 316b33f8be
commit 65de0b22ba
1 changed files with 7 additions and 5 deletions
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content/blog/what-are-uuids/index.md
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@@ -124,7 +124,7 @@ In the meantime, the short version of UUIDv2 is:
UUIDv2 matches the specification for UUIDv1 but replaces some of the timing and clock information with identification numbers for operating system usage.
They're rarely implemented into most UUID libraries and are used even more rarely. This is because of 2 reasons:
They're rarely implemented into most UUID libraries and are used even less. This is because of 2 reasons:
1) They're not documented as part of the newest UUID specification
2) Significant pitfalls in UUIDv2's generation schema that **regularly** leads to collision with other generated UUIDv2s
@@ -137,14 +137,14 @@ Let's say you're creating a database of URLs tracked on your website. You want t
On the other side of the coin: You can't use any random data to store as your URL's primary key since it could introduce duplicate URL entries into your database table.
Is there a good way to generate a unique ID based on a string that will output the same ID if the inputs are the same?
Is there a good way to generate the same unique ID from the same input every single time?
Intro: UUIDv3 and UUIDv5.
Both of these UUID versions take the following information:
- A pre-defined UUID "namespace"
- Any string for a "name"
- A pre-defined UUID (called a "namespace")
- An input string (called a "name")
> The UUID specification establishes 4 pre-defined namespaces for common use cases. The pre-defined namespaces are:
>
@@ -152,6 +152,8 @@ Both of these UUID versions take the following information:
> - [URL](https://en.wikipedia.org/wiki/URL): `6ba7b811-9dad-11d1-80b4-00c04fd430c8`
> - [OID](https://en.wikipedia.org/wiki/Object_identifier): `6ba7b812-9dad-11d1-80b4-00c04fd430c8`
> - [X.500 DN](https://en.wikipedia.org/wiki/X.500): `6ba7b814-9dad-11d1-80b4-00c04fd430c8`
>
> You may also use your own hardcoded UUID as a namespace
These UUID versions output a UUID that contains a hash of the namespace and name concatenated together.
@@ -193,7 +195,7 @@ As UUIDv5's SHA-1 is significantly more secure with hashing its contents.
### Pros of UUIDv3 and UUIDv5
- **Contents are stable**: In instances where you need the input to match the output every time, there are no other UUIDs that can fulfill this use case.
- **Contents are stable**: In instances where you need the output to match the input every time, no other UUID versions can fulfill this use case.
### Cons of UUIDv3 and UUIDv5