Re: Confused identification with authentication.
1. ID cards un Europe are not as compulsory as you think they are.
2. It's not all sorted out either. In Spain the SSN is only used by Social Security, so that's a step forward. On the other hand your ID number is used by everyone else, state or private company or credit reference agency, so that's pretty idiotic. There is no way to get a new number if the old one is compromised, it follows you around for life.