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I learned a few days ago from a friend, when the other leak at the university was reported in the Danish media, that the "random" part is only 4 digits and as a bonus is sequential. So if you register in the country as foreign citizens together with your partner those are likely sequential.

Then again, in my country some municipalities handed out numbers starting with your birth year....

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A good time to remember that cramming data into your identifiers will come back to bite you... It hasn't really been necessary since databases replaced library catalogs anyway.
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I think they do this to make it easier to remember your number. It’s really not private data in the Nordics as others mentioned, even your address and phone number and , on request, salary can be easily found out legally.
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