ABOUT ME
Integrated M.S./Ph.D. Student in Cybersecurity
School of Cybersecurity
Korea University, Seoul, Republic of Korea
I am an integrated M.S./Ph.D. student at PQSnC Lab, School of Cybersecurity, Korea University, advised by Prof. Changmin Lee. My research interests include privacy-preserving protocols, homomorphic encryption, secure multi-party computation, and privacy-preserving machine learning.
UPDATES
I launched this website to share my research, publications, and academic activities.
I started the integrated M.S./Ph.D. program at the Graduate School of Information Security.
RESEARCH
I am interested in the design, implementation, and cryptanalysis of modern cryptographic systems.
Efficient encrypted computation, SIMD packing, key switching, ring switching, and practical protocol design.
Private set intersection and union, secure membership testing, and unbalanced secure computation.
OKVS-based constructions, oblivious ciphertext compression, and communication-efficient protocols.
Structural attacks on lattice-based cryptographic schemes and security analysis of evaluation-key relations.
BACKGROUND
School of Cybersecurity, Korea University
Advisor: Prof. Changmin Lee
Konkuk University
PUBLICATIONS
“PSOs as fast as PSI: Efficient Private Set Operations from Batch Homomorphic OKVS Decoding”
Under review, 2026.
INTELLECTUAL PROPERTY
Hyun Ji Kwag, Junhyuk Kwon, Changmin Lee, Yongha Son
Republic of Korea Patent Application No. 10-2026-0113630.