CODEWITHSUNDEEP
language-agnosticguid
Pure.Krome
Pure.Krome

Reputation: 86967

Given a GUID, if i shorten it .. can we assume it will still be unique?

Given that GUID's are (more or less) unique, if we shorten it with some code which:

It basically just converts a GUID into a base64 string and shortens it a bit. It takes a standard GUID like this:

c9a646d3-9c61-4cb7-bfcd-ee2522c8f633

And converts it into this smaller string:

00amyWGct0y_ze4lIsj2Mw

Can I now assume that the shortened guid is equally as unique as it's previous (normal) form?

Upvotes: 3

Views: 110

Answers (1)

hobbs
hobbs

Reputation: 240010

This is a reversable transform — you can get the original GUID back with an inverse function. That means that it's exactly as "unique"; there's a different "shortened GUID" for every GUID. The final substr step in the encode function is removing the base64 padding characters ==. This doesn't lose any information because every GUID is the same length and therefore every GUID has the same padding. The decode function re-appends "==" before passing to the base64 decoder.

Upvotes: 6

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