The document discusses integrating the Belgian electronic ID (e-ID) card into Android applications. It describes the Belgian e-ID card system and an open source version. It then covers building secure applications for Android, including using secure elements for key storage. The researchers created a prototype application that uses a secure microSD card to interact with an e-ID applet, allowing signing of data. Opportunities for mobile e-ID include easier document signing, but risks include security issues if the phone has malware.