Online Banks and other internet companies in Germany use Post-Ident for this.

It's a service by the post office where you have to go to the next shop, show your personal identification card and they send the post-ident back to the company:

http://www.deutschepost.de/dpag?tab=1&skin=hi&check=yes&lang=de_EN&xmlFile=1016309

http://www.tomshardware.com/news/macbook-gun-shot-israel-security,9269.html

Don't bring a MacBook then..

sudo su -

if you also want to get root's environment...