It's something akin to a service provider in SAML parlance, if we are to believe reporting. How can it be air-gapped?

And if we are to believe the hacked company, it is a development environment with test data in it. That remains to be seen, but is a risky thing to lie about. If there is production data in the leak, we will surely know about it.

The point of a system like this is specifically that it’s accessible and not air gapped.

Being able to validate that a citizen is a citizen and their ID is valid inherently requires the system be accessible

If you need the data, you cannot have it air gapped. And if it is air gapped, it is still easy to make misstakes.

In Aftonbladet comments from CGI they seem to think that no production related data has been leaked:

https://www.aftonbladet.se/nyheter/a/ArvG0E/cgi-sverige-uppg...

some report it's basically the code and certs responsible for BankID SSO

No. CGI has nothing to do with BankID.

IMO the most credible reports suggest that the source code and data involved are related to these four services:

https://www.cgi.com/se/sv/business-process-services/e-tjanst... "Mina engagemang offers a user-friendly and flexible solution that allows your customers to manage their cases directly through a personal portal. Here, users can view, track, and interact with their ongoing cases, which enhances both transparency and efficiency in the communication process." -- some kind of ticket/case management system for gov't agencies

https://www.cgi.com/se/sv/business-process-services/elektron... "With our secure end-to-end e-ID and eSign services, we can help you streamline document and contract management, gain access to all desired e-ID issuers, and improve cost efficiency." -- this sounds like a bad thing to compromise, but is to the best of my understanding a system for digital signatures on documents, and has no relation to BankID

https://www.cgi.com/se/sv/business-process-services/e-tjanst... "Gain better control over your organization’s representatives with our easy-to-use representative registry. By automating the identification and verification of representatives, you’ll gain a clear overview and enhance the security of your processes." -- sounds like some bullshit CRUD app for managing who can "represent" a gov't agency

https://www.cgi.com/se/sv/business-process-services/e-tjanst... "SHS is Sweden’s common standard for information exchange, enabling secure and efficient communication between government agencies, businesses, and organizations." -- this might be bad if real data was leaked

These are services used by various Swedish government agencies and it's pretty bad to have even a test instance of them hacked, but let's calm down. The entire Swedish state has not been compromised here.

So if no data was leaked from the tax agency or from the users, then the leaked "digital signing documents" must have belonged to the only remaining party, which is CGI, so perhaps they were just some marketing documents about the benefits of their digital signing service?

I apparently didn't phrase that very well. If what is the case? I was trying to ask which case was the case, not trying to claim that something specific was the case.

I'm familiar with electronic signatures, and I know what documents are, but I have never heard the phrase "electronic signing documents" and don't know what that is supposed to mean. What kind of documents? Documents about signing, documents that were signed, documents in the sense that files containing keys could be considered documents, or what?

We might've lucked out here, there is some signature data on ID cards today and official _plans_ to make a government backed signing service, but practically _nobody_ uses them in practice to just revoking all those keys will be a minor issue.

Currently most Swede's use a private bank consortisum controlled ID solution for most logins and signatures.