Christian Majenz

Christian Majenz is an Associate Professor in the Department of Applied Mathematics and Computer Science at the Technical University of Denmark (DTU), where he is affiliated with the Cybersecurity Engineering group and the Center for Quantum Technologies. His work bridges theoretical computer science and quantum cryptography, focusing on the security of cryptographic primitives in the post-quantum era.

• Institution: Technical University of Denmark (DTU)
• School: College of Engineering
• Department: Department of Applied Mathematics and Computer Science
• Research Groups: Cybersecurity Engineering, Center for Quantum Technologies

His research centers on the foundations of post-quantum cryptography, particularly the Fujisaki-Okamoto transform, security in the presence of decryption failures, and quantum query models. He investigates how classical cryptographic constructions withstand quantum adversaries, using tools from complexity theory and information-theoretic security. His work often involves formal security proofs in idealized models such as the random oracle model and quantum superposition oracles.

The recent articles reflect a strong trend in analyzing the robustness of post-quantum encryption schemes, especially under active quantum attacks and imperfect implementations. Topics include re-encryption attacks, worst-case correctness, round elimination in identification schemes, and quantum lower bounds via permutation oracles. His publications span high-impact conferences like Eurocrypt, STOC, and Crypto, as well as journals such as Physical Review A, demonstrating interdisciplinary reach across computer science and quantum physics.

Christian Majenz actively supervises multiple PhD students in projects related to quantum-safe cryptology, including post-quantum key agreement, extractability, SHA-3 security, and key encapsulation mechanisms. He leads several funded research projects at DTU, focusing on efficient and provably secure post-quantum cryptographic protocols. While no specific grants or external funding bodies are named in the text, the structured PhD projects indicate institutional or national support.

He is involved in academic activities such as organizing workshops, including 'Quantum Techniques for Provable Security' in October 2021, contributing to community engagement in quantum cryptography. There is no mention of teaching awards, fellowships, or scientific honors in the provided text.