Ragnar Freij

Ragnar Freij is a Senior University Lecturer in the Department of Mathematics and Systems Analysis at Aalto University's School of Science. His research primarily focuses on the intersection of mathematics, information theory, and cryptography, with particular expertise in private information retrieval, coding theory, and combinatorial structures.

Dr. Freij's research interests span several interconnected fields including information retrieval systems, matroid theory, combinatorics, and algebra. His work demonstrates a strong focus on theoretical foundations with practical applications in data security and distributed storage systems. He has made significant contributions to understanding Reed-Muller codes and their applications in private information retrieval protocols, particularly in scenarios involving colluding and Byzantine servers.

His recent publications reveal a consistent research trajectory exploring the mathematical foundations of information retrieval systems, with increasing focus on quantum applications as evidenced by his 2023 work on Quantum Private Information Retrieval. The publications show strong interdisciplinary connections between pure mathematics (particularly combinatorics and algebra) and practical information security applications.

Dr. Freij has been active in academic collaboration, with visiting researcher positions at multiple institutions and numerous conference presentations. His work has garnered significant attention in the research community, with several publications receiving multiple citations in Scopus. He has also engaged with the public through media appearances discussing mathematical concepts.