I am Professor of Computer Science at the University of Münster. I also hold a part-time appointment at the University of Twente.

I work in computer networks and security. My research interests revolve around understanding and improving security on the Internet, taking an empirical approach. At the moment, I work on

  • Global-scale measurement of Internet service deployments and their security
  • Empirical analysis of security technology
  • Implications for policy and governance of technology

I view my work through the lens of real-world implications. The tech is not always what matters—it’s the embedding in our world that makes it meaningful. Hence, I work with other disciplines and industry alike to make the Internet a safer, more secure, and altogether more interesting and useful place.


  • August 2023: Updated my teaching for the winter term 2023/2024.

  • April 2023: I have moved to the University of Münster, where I will form a new group. I am still part-time at the University of Twente.


Before joining the University of Münster as full professor, I was an Associate Professor at the University of Twente in the Netherlands. Before that, I was a Lecturer and Senior Lecturer at the University of Sydney in Australia. Until 2016, I was a Researcher at NICTA (later Data61), also in Sydney, where I worked on network security and was part of the Security Business Team. I hold a PhD from Technical University of Munich. I did both my post-grad and under-grad studies at Eberhard Karls University, Tuebingen, one of Germany’s classic universities.

Selected publications

All publications


Prospective PhD students

PhD positions at the University of Münster and at the University of Twente are generally fully funded and often part of a research project. I advertise these positions publicly, but you can also write me an email to find out if there are any vacancies at the moment. I generally hire only at the University of Münster, but every now and then I may have an opening in Twente as well.

Please read the take the time to find out what I like to work on. Prospective PhD students need a strong background in either computer security or networks. I expect that incoming PhD students can articulate clearly why they want to work in a particular research area.

I currently work with the following PhD students:

  • Gustavo Luvizotto (University of Twente)
  • Bulut Ulukapi (University of Twente)
  • Shyam Krishna Khadka (University of Twente)
  • Matteo Liberato (University of Twente)
  • Sousan Tarahomi (University of Twente)
  • Niousha Nazemi (University of Sydney)

Bachelor and Master students

I generally have a range of topics in the area of Internet measurement and network security. Please contact me if you are interested in doing a thesis with me. Please note: I do not offer Bachelor theses at the University of Twente.


I teach the following courses in the winter term 2023/2024:

  • Vorlesung Betriebssysteme (BSc, in German)
  • Ringvorlesung Netzwerke und Sicherheit, with Dietmar Lammers (BSc, in German)
  • Seminar Empirische Forschung in Computernetzwerken (MSc, in German)

The plan for the summer term 2024 is to teach:

  • Vorlesung Computernetzwerke (BSc and MSc, in German)
  • Network and System Security (MSc, in English)

The plan for the winter term 2024/25 is very tentative and may include:

  • Ringvorlesung Netzwerke und Sicherheit, with Dietmar Lammers (BSc, in German)
  • Seminar Empirische Forschung in Computernetzwerken (MSc, in English)
  • Empirical Security Analysis & Engineering (MSc, in English, co-taught in Münster and Twente)


  • +49 251 83 38 447
  • Einsteinstr. 62, 48149 Münster, Germany