![](/assets/images/index/revolution-slider/step1.jpg)
A challenge-question displayed in the authentication form on the website
![](/assets/images/index/revolution-slider/step2.jpg)
The mobile application E-NUM receives a PUSH-confirmation and displays the only correct challenge-response
![](/assets/images/index/revolution-slider/step3.jpg)
After clicking "Send challenge-response" in the mobile application E-NUM or entering the challenge-response on the form by yourself you will be authenticated!