Lucjan Hanzlik
Tenure-track Faculty
I am a tenure-track faculty member at the CISPA Helmholtz Center for Information Security, where my research focuses on privacy-preserving and applied cryptography. My work explores the design and analysis of secure systems and protocols that enable strong privacy guarantees, bridging foundational research and practical applications. Before my current position, I was a Visiting Assistant Professor at Stanford University and a Research Group Leader at CISPA. I hold a Ph.D. in Computer Science from the Institute for Computer Science of the Polish Academy of Sciences in Warsaw, which I obtained in January 2016 (with distinction) under the supervision of Prof. Mirosław Kutyłowski. I have had the privilege of publishing my work at premier venues in computer science, including Crypto, Eurocrypt, Asiacrypt, USENIX Security, IEEE S&P, and CCS. My contributions have been recognized through various honors, most notably the IBM Great Minds Award. I am also an active member of the cryptographic community and a regular participant in international conferences and workshops. My broader research interests include privacy-enhancing cryptography and the practical deployment of cryptographic schemes in a rapidly evolving technological landscape. At CISPA, I aim to advance both theoretical and applied aspects of cryptography to address the critical challenges posed by modern information security.
Program Committees: LATINCRYPT 2025, ACM CCS (2025, 2024, 2023), PKC 2025, FC 2025, PETS (2025, 2024, 2023), WPES 2024 , CRYPTO 2024, ASIACRYPT 2023
PROJECTS- Upcoming/Ongoing
- DAAD Joint Australia–Germany Research Co-operation Scheme "Secure Online Authentication with Attributes"
- DFG-NCN Weave "Identity Wallet in a Hostile Environment: Privacy and Trust By-Design"
- Students: Khue Do (PhD) (2020-); Wei-Zhu Yeoh (PhD) (2020-); Eugenio Paracucchi (PhD) (2022-);
- Internships: Maksymilian Górski (Wrocław University of Science and Technology, Aug. 2024);
- Visitors: Hien Chu (FAU Erlangen-Nürnberg, Aug.-Sep. 2024); Sri Aravinda Krishnan Thyagarajan (University of Sydney, Apr. 2024); Michał Kępkowski (Macquarie university, Oct. 2022, Apr.-May. 2023);
Below you can find a list of my publications including preprints. Authors are listed alphabetically by last name, except where indicated by an asterisk.
Full Version Publisher Version Slides Web Bibtex Additional Material
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| 2024 | Sofía Celi, Scott Griffy, Lucjan Hanzlik, Octavio Perez Kempner, Daniel Slamanig - "SoK: Signatures With Randomizable Keys" - 28th International Conference on Financial Cryptography and Data Security - FC 2024 . |
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| 2024 | Wei-Zhu Yeoh, Lucjan Hanzlik, Oliver Valta - "Delegating FIDO Credentials Using Single-use ECDSA Signatures" - 19th ACM ASIA Conference on Computer and Communications Security - ACM ASIACCS 2024 . |
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| 2024 | Lucjan Hanzlik, Julian Loss, Sri Aravinda Krishnan Thyagarajan, Benedikt Wagner - "Sweep-UC: Swapping Coins Privately" - 45th IEEE Symposium on Security and Privacy - S&P 2024 . |
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| 2024 | Khue Do, Lucjan Hanzlik, Eugenio Paracucchi - "M&M'S: Mix and Match Attacks on Schnorr-Type Blind Signatures with Repetition" - 43nd Annual International Conference on the Theory and Applications of Cryptographic Techniques - EUROCRYPT 2024 . |
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| 2023 | Lucjan Hanzlik, Julian Loss, Benedikt Wagner - "Rai-Choo! Evolving Blind Signatures to the Next Level" - 42nd Annual International Conference on the Theory and Applications of Cryptographic Techniques - EUROCRYPT 2023 . |
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| 2023 | Hien Chu, Khue Do, Lucjan Hanzlik - "On the Security of Rate-limited Privacy Pass" - 30th ACM Conference on Computer and Communications Security - ACM CCS 2023 . |
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| 2023 | Lucjan Hanzlik - "Non-interactive Blind Signatures for Random Messages" - 42nd Annual International Conference on the Theory and Applications of Cryptographic Techniques - EUROCRYPT 2023 . |
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| 2023 | Sihang Pu, Sri Aravinda Krishnan Thyagarajan, Nico Döttling, Lucjan Hanzlik - "Post Quantum Fuzzy Stealth Signatures and Applications" - 30th ACM Conference on Computer and Communications Security - ACM CCS 2023 . |
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| 2023 | Wei-Zhu Yeoh, Michal Kepkowski, Gunnar Heide, Dali Kaafar, Lucjan Hanzlik - "Fast IDentity Online with Anonymous Credentials (FIDO-AC)" - 32th USENIX Security Symposium - USENIX Security 2023 . |
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| 2023 | Lucjan Hanzlik, Julian Loss, Benedikt Wagner - "Token meets Wallet: Formalizing Privacy and Revocation for FIDO2" - 44th IEEE Symposium on Security and Privacy - S&P 2023 . |
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| 2023 | Nico Döttling, Lucjan Hanzlik, Bernardo Magri, Stella Wohnig - "McFly: Verifiable Encryption to the Future Made Practical" - 27th International Conference on Financial Cryptography and Data Security - FC 2023 . |
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| 2022 | Rutchathon Chairattana-Apirom, Lucjan Hanzlik, Julian Loss, Anna Lysyanskaya, Benedikt Wagner - "Practical Round-Optimal Blind Signatures in the Standard Model" - 42th Annual International Cryptology Conference - CRYPTO 2022 . |
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| 2022 | Fabian Schwarz, Khue Do, Gunnar Heide, Lucjan Hanzlik, Christian Rossow - "FeIDo: Recoverable FIDO2 Tokens Using Electronic IDs." - 29th ACM Conference on Computer and Communications Security - ACM CCS 2022 . |
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| 2022 | Lucjan Hanzlik, Kamil Kluczniak - "Explainable Arguments" - 26th International Conference on Financial Cryptography and Data Security - FC 2022 . |
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| 2022 | Lucjan Hanzlik, Kamil Kluczniak - "Explainable Arguments" - 27th European Symposium on Research in Computer Security - ESORICS 2022 . |
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| 2019 | Michael Backes, Lucjan Hanzlik, Jonas Schneider-Bensch - "Membership Privacy for Fully Dynamic Group Signatures" - 26th ACM Conference on Computer and Communications Security - ACM CCS 2019 . |
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| 2021 | Lucjan Hanzlik, Daniel Slamanig - "With a Little Help from My Friends: Constructing Practical Anonymous Credentials" - 28th ACM Conference on Computer and Communications Security - ACM CCS 2021 . |
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| 2020 | Dan Boneh, Saba Eskandarian, Lucjan Hanzlik, Nicola Greco - "Single Secret Leader Election" - 2nd ACM Conference on Advances in Financial Technologies - AFT 2020 . |
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| 2020 | Ilkan Esiyok, Lucjan Hanzlik, Robert Künnemann, Lena Marie Budde, Michael Backes - "TrollThrottle - Raising the Cost of Astroturfing" - 18th International Conference on Applied Cryptography and Network Security - ACNS 2020 . |
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| 2019 | Dhiman Chakraborty, Lucjan Hanzlik, Sven Bugiel - "simTPM: User-centric TPM for Mobile Devices" - 28th USENIX Security Symposium - USENIX Security 2019 . |
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| 2019 | Michael Backes, Nico Döttling, Lucjan Hanzlik, Kamil Kluczniak, Jonas Schneider - "Ring Signatures: Logarithmic-Size, No Setup - from Standard Assumptions" - 38nd Annual International Conference on the Theory and Applications of Cryptographic Techniques - EUROCRYPT 2019 . |
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| 2019 | Michael Backes, Lucjan Hanzlik, Amir Herzberg, Aniket Kate, Ivan Pryvalov - "Efficient Non-Interactive Zero-Knowledge Proofs in Cross-Domains Without Trusted Setup" - 22st IACR International Conference on Practice and Theory of Public-Key Cryptography - PKC 2019 . |
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| 2018 | Michael Backes, Lucjan Hanzlik, Kamil Kluczniak, Jonas Schneider - "Signatures with Flexible Public Key: Introducing Equivalence Classes for Public Keys" - 24th Annual International Conference on the Theory and Application of Cryptology and Information Security - ASIACRYPT 2018 . |
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| 2022 | Michal Kepkowski, Lucjan Hanzlik, Ian D. Wood, Mohamed Ali Kâafar - "How Not to Handle Keys: Timing Attacks on FIDO Authenticator Privacy" - Proceedings on Privacy Enhancing Technologies . |
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| 2016 | Lucjan Hanzlik - "Cryptographic Protocols for Modern Identification Documents" - PhD Thesis, Institute of Computer Science Polish Academy of Sciences, 2016 . |
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