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.


  • Computer Science

    • Attack
    • Biometric Template Protection
    • Homomorphic Encryption
    • Protection Scheme
    • Biometric Data
    • Biometrics
    • Malicious Adversary
    • Multiple Attribute



Improved Multiplication-Free Biometric Recognition under EncryptionIEEE Transactions on Biometrics, Behavior, and Identity Science (E-pub ahead of print/First online). Bassit, A., Hahn, F., Veldhuis, R. & Peter, A.https://doi.org/10.1109/TBIOM.2023.3340306Fast and Accurate Biometric Search under Encryption. University of Twente. Bassit, A.https://doi.org/10.3990/1.9789036559218A Comparison of Authentication Protocols for Unified Client ApplicationsIn 2023 International Symposium on Networks, Computers and Communications (ISNCC) (pp. 1-7). IEEE. Breggeman, F., El-hajj, M. & Hahn, F.https://doi.org/10.1109/ISNCC58260.2023.10323861Security Aspects of Digital Twins in IoT, 560-567. El-hajj, M. & Hahn, F.https://doi.org/10.5220/0011714500003405Multiplication-Free Biometric Recognition for Faster Processing under EncryptionIn 2022 IEEE International Joint Conference on Biometrics (IJCB) . IEEE. Bassit, A., Hahn, F., Veldhuis, R. N. J. & Peter, A.https://doi.org/10.1109/IJCB54206.2022.10007958I Still Know What You Watched Last Sunday: Privacy of the HbbTV Protocol in the European Smart TV LandscapeIn The Network and Distributed System Security Symposium (NDSS) . Tagliaro, C., Hahn, F., Sepe, R., Aceti, A. & Lindorfer, M.https://www.ndss-symposium.org/ndss-paper/i-still-know-what-you-watched-last-sunday-privacy-of-the-hbbtv-protocol-in-the-european-smart-tv-landscape/Private Sampling with Identifiable CheatersIn 23rd Privacy Enhancing Technologies Symposium (pp. 361-383). Sabater, C., Hahn, F., Peter, A. & Ramon, J.https://doi.org/10.56553/popets-2023-0058Template Recovery Attack on Homomorphically Encrypted Biometric Recognition Systems with Unprotected Threshold ComparisonIn 2023 IEEE International Joint Conference on Biometrics (IJCB). Bassit, A., Hahn, F., Rezgui, Z., Kelly, U. M., Veldhuis, R. & Peter, A.
Repeated Knowledge Distillation with Confidence Masking to Mitigate Membership Inference AttacksIn 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. Mazzone, F., van den Heuvel, L., Huber, M., Verdecchia, C., Everts, M. H., Hahn, F. & Peter, A.https://doi.org/10.1145/3560830.3563721Hybrid biometric template protection: Resolving the agony of choice between bloom filters and homomorphic encryptionIET biometrics, 11(5), 430-444. Bassit, A., Hahn, F., Veldhuis, R. & Peter, A.https://doi.org/10.1049/bme2.12075

Research profiles

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), room 2025
Hallenweg 19
7522 NH Enschede

Navigate to location


Scan the QR code or
Download vCard