dr.ing. F.W. Hahn (Florian)

Assistant Professor

About Me

I am an Assistant Professor in the Semantics, Cyber Security and Services group at the University of Twente in the Netherlands.

Before joining the University of Twente, I was a permanent researcher at SAP Security Research in Karlsruhe, Germany. There I worked in the area applied cryptography, in particular on searchable encryption and encrypted databases. I obtained my Ph.D. with distinction from the Karlsruhe Institute of Technology (KIT) in Germany.

My interests are widespread in topics that are related to security and privacy, and my research is particularly focused on data encryption during processing for data outsourcing scenarios. These research results have various real-world applications such as encrypted storage for cloud computing, privacy-preserving machine-learning and protection of biometric data.


Engineering & Materials Science
Query Processing


Bassit, A. (2023). Fast and Accurate Biometric Search under Encryption. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036559218
Sabater, C. , Hahn, F., Peter, A., & Ramon, J. (2023). Private Sampling with Identifiable Cheaters. In 23rd Privacy Enhancing Technologies Symposium (pp. 361-383) https://doi.org/10.56553/popets-2023-0058
El-hajj, M. , & Hahn, F. (2023). Security Aspects of Digital Twins in IoT. 560-567. Paper presented at 9th International Conference on Information Systems Security and Privacy, ICISSP 2023, Lisbon, Portugal. https://doi.org/10.5220/0011714500003405
Bassit, A. , Hahn, F. , Veldhuis, R. N. J. , & Peter, A. (2023). Multiplication-Free Biometric Recognition for Faster Processing under Encryption. In 2022 IEEE International Joint Conference on Biometrics (IJCB) (IEEE International Joint Conference on Biometrics (IJCB); Vol. 2022). IEEE. https://doi.org/10.1109/IJCB54206.2022.10007958
Weener, J. , Hahn, F. , & Peter, A. (2022). Libertas: Backward Private Dynamic Searchable Symmetric Encryption Supporting Wildcards. In Data and Applications Security and Privacy XXXVI : 36th Annual IFIP WG 11.3 Conference, DBSec 2022, Newark, NJ, USA, July 18–20, 2022, Proceedings (pp. 215-235) https://doi.org/10.1007/978-3-031-10684-2_13
Mazzone, F., van den Heuvel, L., Huber, M., Verdecchia, C. , Everts, M. H. , Hahn, F. , & Peter, A. (2022). Repeated Knowledge Distillation with Confidence Masking to Mitigate Membership Inference Attacks. In AISec 2022 - Proceedings of the 15th ACM Workshop on Artificial Intelligence and Security, co-located with CCS 2022 (pp. 13-24). Association for Computing Machinery. https://doi.org/10.1145/3560830.3563721
Dijkslag, M., Damie, M. , Hahn, F. , & Peter, A. (2022). Passive Query-Recovery Attack Against Secure Conjunctive Keyword Search Schemes. In G. Ateniese, & D. Venturi (Eds.), Conference Proeedings Applied Cryptography and Network Security (pp. 126-146). Springer. Advance online publication. https://doi.org/10.1007/978-3-031-09234-3_7
Groot Roessink, R. , Peter, A. , & Hahn, F. (2021). Experimental Review of the IKK Query Recovery Attack: Assumptions, Recovery Rate and Improvements. In K. Sako, & N. O. Tippenhauer (Eds.), Applied Cryptography and Network Security: 19th International Conference, ACNS 2021, Kamakura, Japan, June 21–24, 2021, Proceedings (Vol. I, pp. 155-183). (Lecture Notes in Computer Science; Vol. 12727). Springer. https://doi.org/10.1007/978-3-030-78375-4_7

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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

Contact Details

Visiting Address

University of Twente
Faculty of Electrical Engineering, Mathematics and Computer Science
Zilverling (building no. 11), room 2025
Hallenweg 19
7522NH  Enschede
The Netherlands

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Mailing Address

University of Twente
Faculty of Electrical Engineering, Mathematics and Computer Science
Zilverling  2025
P.O. Box 217
7500 AE Enschede
The Netherlands