Ernst-Joachim Steffens

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Transaction services such as payment or ticketing, but also security-sensitive services such as user identification or facility access control are increasingly executed in electronic format. With the concept of the SIM-based mobile wallet, this paper presents an integrative approach to electronic transaction services, combining the user experience of(More)
Both increasing competition from established web companies and over-the-top players, and business opportunities from new Web 2.0 related services give reason to telcos to open up their service delivery platforms for integrative offerings in the frame of the Web 2.0 service ecosystem. While the web community provides innovative and hyped services that are(More)
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