OPC Data Source with sign and encryption

When setting up an OPC data source, if Sign & Encrypt is selected for the Security Mode, Tulip is looking for a Private Key and Certificate file. I assume the certificate file can be created from the .der file from the OPC server (KepServer in my case).

Questions:
Where does the Private Key come from?
Is this something that comes from the OPC server also?
How do I create the Private Key file?

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I’m looking into getting Sign&Encrypt setup as well but cant seem to find any info related to it in Kepware help files.

Maybe @royshilkrot /@Het/or any other users who’s set this up can point us in the right direction?