Lena Heimberger

Dipl.-Ing. BSc

Cryptology & Privacy, PhD Student

Lena Heimberger is a PhD Student at Graz University of Technology, advised by Prof. Christian Rechberger. Her main research interests are designing and implementing low-level privacy-preserving primitives, especially OPRFs, and on how to translate them to a post-quantum setting. Her research interests include

mathematical cryptography, namely cool cryptography built from algebra
scalable and privacy-preserving cryptography, especially considering tradeoffs like bandwidth and parallelization. I currently work on both Private Information Retrieval and Oblivoius Pseudorandom Functions.
distributed computing, especially large-scale networks and federation, as well as messaging
as well as the legal aspects of the above, it would be nice to have a legislative ground to enforce privacy.

If you are a student looking for a thesis, project, or internship. I usually have some topic ideas that are in an early stage of development. If you are curious about any of the topics above, I'm happy to hear from you! Independently, I am always happy to hear from students regardless. If you think I can help you with something, you would like to discuss a topic further or just want to go to lunch and talk about university things, do write me.

+43 316 873 - 5509
lena.heimberger@tugraz.at
https://www.heimberger.xyz/
IF01010
TUGRAZ online

Teaching

I teach cryptography as a part of:

Privacy Enhancing Technologies (WS2023/24)
Modern Public Key Cryptography (SS 2023, SS 2024)
Secure Application Design (SS 2024)

I used to teach cryptography as a part of:

Mathematical Foundations of Cryptography (WS 2022/2023)

I do not have fixed office hours, but I am available if you have questions, concerns, or if you just want to talk about course material or cryptography in general. Should you want to write a thesis in my general area of research, I'm happy to explore potential topics. Please just send me an E-Mail so we can schedule an appointment!

Publications

LEAP: A Fast, Lattice-based OPRF with Application to Private Set Intersection

Heimberger L., Kales D., Lolato R., Mir O., Ramacher S., Rechberger C.
Advances in Cryptology – EUROCRYPT 2025 - 44th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Proceedings, Eurocrypt 2025, 254-283, (Lecture Notes in Computer Science; vol. 15607 LNCS)

BISON: Blind Identification with Stateless scOped pseudoNyms

Heher J., More S., Heimberger L.
Proceedings of the 2025 ACM Asia Conference on Computer and Communications Security, 20th ACM ASIA Conference on Computer and Communications Security

OPRFs from Isogenies

Heimberger L., Hennerbichler T., Meisingseth F., Ramacher S., Rechberger C.
ACM AsiaCCS 2024 - Proceedings of the 19th ACM Asia Conference on Computer and Communications Security, 19th ACM ASIA Conference on Computer and Communications Security, 575-588

More Publications