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I'm a postdoc in the cryptographic engineering group led by Peter Schwabe at MPI-SP. My work concerns vulnerabilites and attacks arising from the post-quantum migration effort. This includes, but is not limited to, side-channel and fault attacks on lattice-based schemes.
I obtained my Master's of Mathematics from the University of Munich in 2020. During my Master's I focused on algebraic number theory and algebraic geometry. From 2014 to 2020, I was a working student at Infineon; in my last two years as a working student, I was supervised by Thomas Pöppelmann. In 2024, I obtained my PhD from Universität der Bundeswehr in cooperation with Infineon Technologies supervised by Gabi Dreo, Thomas Pöppelmann, and Peter Pessl. My committee consisted of Gabi Dreo, Mark Manulis, Eirini Ntoutsi, Christof Paar, and Arno Wacker.
Julius Hermelink
julius.hermelink@mpi-sp.org
Max-Planck-Institute for Security and
Privacy
Universitätsstraße 140
44799 Bochum (Germany)
Publications
- Zhenzhi Lai, Ruiyi Zhang, Zhiyuan Zhang, Julius Hermelink, Michael Schwarz, Van-Thuan Pham, and Udaya Parampalli. You Only Decapsulate Once: Ciphertext-Independent Single-Trace Passive Side-Channel Attacks on HQC. Preprint.
- Julius Hermelink, Erik Mårtensson, Maggie Tran. Noise-Tolerant Plaintext-Checking Oracle Attacks -- A Soft-Analytic Approach Applied to ML-KEM. Preprint.
- Dina Hesse, Jakob Feldtkeller, Tim Güneysu, Julius Hermelink, Georg Land, Markus Krausz, Jan Richter-Brockmann. t-Probing (In-) Security-Pitfalls on Noise Assumptions. Preprint.
- Julius Hermelink, Kai-Chun Ning, Richard Petri. Finding and Protecting the Weakest Link: On Side-Channel Attacks on y in Masked ML-DSA. Accepted at Crypto 2025.
- Julius Hermelink, Silvan Streit, Erik Mårtensson, and Richard Petri. A Generic Framework for Side-Channel Attacks Against LWE-Based Cryptosystems. In: Advances in Cryptology – EUROCRYPT 2025, Part VIII. ed. by Serge Fehr and Pierre-Alain Fouque. Vol. 15608. Lecture Notes in Computer Science. Madrid, Spain: Springer, Cham, Switzerland, May 2025, pp. 3–32.
- Julius Hermelink, Kai-Chun Ning, Richard Petri, and Emanuele Strieder. The Insecurity of Masked Comparisons: SCAs on ML-KEM’s FO-Transform. In: ACM CCS 2024: 31st Conference on Computer and Communications Security. Ed. by Bo Luo, Xiaojing Liao, Jun Xu, Engin Kirda, and David Lie. Salt Lake City, UT, USA: ACM Press, Oct. 2024, pp. 2430–2444.
- Julius Hermelink, Erik Mårtensson, Simona Samardjiska, Peter Pessl, and Gabi Dreo Rodosek. Belief Propagation Meets Lattice Reduction: Security Estimates for Error-Tolerant Key Recovery from Decryption Errors. In: IACR Transactions on Cryptographic Hardware and Embedded Systems 2023.4 (2023), pp. 287–317.
- Julius Hermelink, Silvan Streit, Emanuele Strieder, and Katharina Thieme. Adapting Belief Propagation to Counter Shuffling of NTTs. In: IACR Transactions on Cryptographic Hardware and Embedded Systems 2023.1 (2023), pp. 60–88.
- Julius Hermelink, Peter Pessl, and Thomas Pöppelmann. Fault-Enabled Chosen-Ciphertext Attacks on Kyber. In: Progress in Cryptology - INDOCRYPT 2021 - 22nd International Conference on Cryptology in India, Jaipur, India, December 12-15, 2021, Proceedings. Ed. by Avishek Adhikari, Ralf Küsters, and Bart Preneel. Vol. 13143. Lecture Notes in Computer Science. Springer, 2021, pp. 311–334.
- Mike Hamburg, Julius Hermelink, Robert Primas, Simona Samardjiska, Thomas Schamberger, Silvan Streit, Emanuele Strieder, and Christine van Vredendaal. Chosen Ciphertext k-Trace Attacks on Masked CCA2 Secure Kyber. In: IACR Transactions on Cryptographic Hardware and Embedded Systems 2021.4 (2021), pp. 88–113. issn: 2569-2925.
- Julius Hermelink, Thomas Pöppelmann, Marc Stöttinger, Yi Wang, and Yong Wan. Quantum safe authenticated key exchange protocol for automotive application. In: 18-th escar Europe : The World’s Leading Automotive Cyber Security Conference (Konferenzveröffentlichung). 2020.
Academic Services
Program Committees
(Sub-)Reviews
- Asiacrypt 2025
- Crypto 2025
- Eurocrypt 2024
- Transactions on Computers
- EURASIP
Theses
- Side-Channel and Fault Attacks in Modern Lattice-Based Cryptography. Supervisor: Prof. Dr. Gabi Dreo.
- Identifying Frobenius elements and calculating Galois Gauss sums. Supervisor: Prof. Dr. Werner Bley.
- Klassifikation Quadratischer Formen über den rationalen Zahlen. Supervisor: Prof. Dr. Andreas Rosenschon.