Hi Stijn,

>  Now, if you wanted to do credential validation, you could push the 
>  base64 encoding of an X.509 AC for your subject in the request. This is, 
>  you would use something like
>  <Attribute AttributeId="urn:oid:"><AttributeValue>Base64 
>  encoding of certificate here</AttributeValue>
>  </Attribute>

I'm sorry but I don't succeed to create the "Base64 encoding of certificate". How can I obtain it? Unfortunatly I don't find any useful suggestions on the web.

Thank you again

Kind regards