I am a PhD candidate at the Chair of Security in Information Technology (TUM), researching the security of cryptographic implementations in the post-quantum era.
My work focuses on analyzing and strengthening post-quantum schemes against side-channel and fault attacks, bridging theoretical research with practical embedded implementations.
Before joining TUM, I worked at Elektrobit as a Security Software Engineer, where I integrated cryptographic and AUTOSAR security modules and contributed to the QuantumRISC project. I also spent several months at Nagoya University (Japan) collaborating on network security research.
I am passionate about applied cryptography, system-level security, and mentoring students in the field of embedded and information security.
Research Interests
My research combines hardware-close system design with cryptanalysis to understand and improve real-world cryptographic implementations.
- (Post-Quantum) Cryptography – practical deployment, evaluation, and integration of post-quantum schemes.
- Side-Channel and Fault Attacks – single-trace and multi-trace leakage analysis, countermeasure evaluation, and fault injection resilience.
- Cryptographic Integrations – embedding secure primitives and PQC algorithms into automotive and embedded frameworks
- System and Network Security – secure communication, SDN-based access control, and dynamic defense orchestration.
If you are interested in collaborating, discussing ideas, or exploring potential research opportunities, feel free to reach out at florian.griesser@tum.de.
Publications
“Automating SDN-ACLs with User Groups and Authentication Events.”
Florian Grießer, Atsushi Shinoda, Hirokazu Hasegawa, Hajime Shimada
Proceedings of the 23rd International Conference on Networks (ICN 2024).
Abstract
Due to emerging cybersecurity threats, traditional networks struggle to adapt to new challenges because of their static nature and need for manual adjustments. In contrast, Software-defined Networks (SDN) offer flexibility to overcome these limitations. We propose a system for automatically generating Access Control Lists (ACLs) from authentication events, reducing manual work and enhancing security. The evaluation shows that dynamically generated ACLs can effectively isolate clients and improve network resilience.
“Evaluation, Integration, and Demonstration of Use Cases – QuantumRISC.”
Maurice Heymann, Burak Selcuk (Continental AG); Florian Grießer, Anahita Hamidi, Hannes Hennig, Lars Müller (Elektrobit Automotive GmbH); Evangelos Karatsiolis (MTG AG)
Project Report, QuantumRISC, Work Package 6, 2023.
Abstract
The QuantumRISC project, funded by the German Federal Ministry of Education and Research (BMBF), aims to bring Post-Quantum Cryptography (PQC) from theory into practice. Work Package 6 focuses on implementing PQC schemes in automotive embedded controllers using AUTOSAR Classic, demonstrating the feasibility and performance of Kyber and Dilithium.
Patents
Maurice Heymann, Hannes Henning, Florian Grießer, Lars Christian Müller, Anahita Hamidi.
(Pending) “Method for Transmitting and/or Receiving Encrypted Data Packets.”
European Patent Application EP4518242A1, 2024.
Abstract
Embodiments of the present disclosure relate to an electronic control unit, an apparatus, a data carrier, a computer program, and a method for securing a vehicle against quantum computer-based security threats. The method comprises providing a crypto (cryptographic/cryptography) software stack comprising an upper layer including a crypto (cryptographic/cryptography) service manager and a lower layer including a crypto driver which includes one or more post-quantum cryptography (PQC) primitives. Further, the method includes forwarding a request for a cryptographic service from the crypto service manager to the crypto driver and providing, by the crypto (cryptographic/cryptography) driver, one or more of the PQC primitives for providing the requested cryptographic service.
Projects
You can find my public projects on GitHub.
If you are looking for a specific or research-related repository, it may still be private or hosted on GitLab — feel free to reach out to me.
Below you can find a selection of my GitHub repositories:
Volunteering
I support the IMPACT Community as a volunteer, contributing my experience in technology and security to help startups and non-profit initiatives grow sustainably.
I am happy to advise and mentor early-stage founders, social enterprises, and organizations that focus on social good or public benefit.
If you are working on a project with a social, educational, or non-profit impact, feel free to reach out at contact[a]flogriesser.de .
Please note that I volunteer my time only for initiatives that create genuine value for society — commercial or profit-oriented requests will not be considered.
Students
I am happy to supervise motivated students in the areas of cryptography, system security, and post-quantum research.
You can find open Bachelor’s, Master’s, and Research Internship topics here.
Further opportunities from my colleagues are available here,
or you can propose your own topic by contacting me at florian.griesser@tum.de.
Contact Me
If you’d like to get in touch:
– For university or research matters, please write to florian.griesser@tum.de.
– For general or private inquiries, use contact[a]flogriesser.de.