I am a researcher in the field of Security & Privacy of Information Systems - especially those involving Web Technologies.Ā My main focus here lies on examining the security and privacy guarantees of underlying protocols on which we rely every day. I love to distribute responsibilities and to lower dependencies -Ā for which applied crypto methods are often well suited.

In addition to their technical building blocks, I observeĀ information systems from a bird’s-eye perspectiveĀ to identify socio-technical dependencies, to shed light on underlying trust assumptions, and to explore ways to reduce the complexity of the processes involved.

Expertise

  • Biochemistry, Genetics and Molecular Biology

    • Privacy
  • Computer Science

    • Misplaced Trust

Organisations

Publications

2026

2025

The Importance of Being Earnest: Shedding Light on Johnny's (False) Sense of Privacy (2025)In 2025 IEEE Symposium on Security and Privacy (SP). Agahari, W., Dirksen, A., Johns, M., de Reuver, M. & Fiebig, T.https://doi.org/10.1109/sp61157.2025.00150Don't Patch the Researcher, Patch the Game: A Systematic Approach for Responsible Research via Federated Ethics Boards (2025)In NSPW '24: Proceedings of the New Security Paradigms Workshop (pp. 126-141). Dirksen, A., Giessler, S., Erz, H., Johns, M. & Fiebig, T.https://doi.org/10.1145/3703465.3703475

2023

Network Responses to Russia's Invasion of Ukraine in 2022: A Cautionary Tale for Internet Freedom (2023)In 32nd USENIX Security Symposium (USENIX Security 23). Ramesh, R., Raman, R. S., Virkud, A., Dirksen, A., Huremagic, A., Fifield, D., Rodenburg, D., Hynes, R., Madory, D. & Ensafi, R.

2021

LogPicker: Strengthening Certificate Transparency Against Covert Adversaries (2021)In Proceedings on Privacy Enhancing Technologies (Proceedings on Privacy Enhancing Technologies; Vol. 2021). Dirksen, A., Klein, D., Michael, R., Stehr, T., Rieck, K. & Johns, M.https://doi.org/10.2478/popets-2021-0066

Research profiles

Courses academic year 2025/2026

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.

Address

University of Twente

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

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Organisations

Additional contact information

Room: 2003 (Zilverling)

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