I am a Full Professor at the University of MĆ¼nster, and I also work part-time in theĀ Design and Analysis of Communication Systems GroupĀ at theĀ University of Twente.

Until 2019, I was aĀ Lecturer in Networks and Security at the University of Sydney (thatā€™s Asst. Prof. in other systems), Australia. Before that, I was aĀ Researcher at NICTA (later CSIRO's Data61), also in Sydney, where I worked on network security and was part of the Security Business Team.

I hold a PhD fromĀ Technical University of Munich. I did both my post-grad and under-grad studies atĀ Eberhard Karls University, Tuebingen, one of Germanyā€™s classic universities.


My research interests revolve around understanding and improving the Internet for everyone, with a particular focus on security aspects. Most recently, I have been working on

  • Global-scale measurement of Internet service deployments and their security
  • Data-driven security mechanisms
  • Analysis of emerging technology and its implications

I view my work through the lens of real-world implications. The tech is not always what mattersā€”itā€™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.


Assessing the security of Internet paths: A case study of Dutch critical infrastructuresIn Applied Networking Research Workshop (ANRW 24). Association for Computing Machinery (E-pub ahead of print/First online). Khadka, S. K., Bayhan, S., Holz, R. & Hesselman, C. E. W.https://doi.org/10.1145/3673422.3674899Towards Security Transparency ofĀ Autonomous Systems onĀ theĀ InternetIn Computer Security. ESORICS 2023 International Workshops: CPS4CIP, ADIoT, SecAssure, WASP, TAURIN, PriST-AI, and SECAI, The Hague, The Netherlands, September 25ā€“29, 2023, Revised Selected Papers, Part II (pp. 510-513). Springer Nature. Khadka, S. K., Holz, R. & Hesselman, C.https://doi.org/10.1007/978-3-031-54129-2_30
On the Asymmetry of Internet eXchange Points - Why Should IXPs and CDNs Care?In 18th International Conference on Network and Service Management. Bertholdo, L., Ferreira, S. L. A., Ceron, J. M., Holz, R., Granville, L. Z. & van Rijswijk - Deij, R. M.
A message from the program chairs of TAURIN 2021In TAURIN 2021 - Proceedings of the 2021 ACM SIGCOMM Workshop on Technologies, Applications, and Uses of a Responsible Internet. Holz, R. & Abhishta, A.https://dl.acm.org/doi/proceedings/10.1145/3472951

Research profiles

I currently teach:

  • Empirical Security Analysis & EngineeringĀ (202100073)

I am a Fellow of the UK's Higher Education Academy.

Affiliated study programs

Courses academic year 2023/2024

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses academic year 2022/2023


University of Twente

Zilverling (building no. 11)
Hallenweg 19
7522 NH Enschede

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