Find out what PKIOverheid G4 means for Nuts

[reinkrul]

https://www.logius.nl/onze-dienstverlening/toegang/pkioverheid/wees-voorbereid-de-nieuwe-generatie-pkioverheidcertificaten-komen-eraan

First analysis:

New G4 PKIoverheid Private certificates:

• Can still be used as a client certificate
• Are still valid for just as long as the current certificates
• Require support for RSA-PSS as cryptographic algorithm, in line with NCSC (mainly concerns network infrastructure, such as proxies)
• Require the inclusion of G4 Certificate Authorities in the trust store (action required from Nuts node administrators at software vendors), otherwise a requesting party may be unable to establish a
  connection with a data source holder.
• It is not yet clear to me from when the G4 certificates will be available

We need to find out what it means for the UZI server-certificate-backed credentials.