Date and Time: Monday, October 19, 2026, 10:00 AM to 12:00

Room: E9-309, Kogiso Laboratory, UEC (https://www.kimilab.tokyo/en/direction)

Speaker: Yeongjun Jang (Seoul National University, South Korea)

Title: Bootstrapping-Free Ring-LWE Based Encrypted Dynamic Control

Abstract: In this talk, I will give a brief tutorial on Ring Learning With Errors (Ring-LWE) based homomorphic encryption schemes and introduce my recent results on its application to encrypted dynamic control. We show how classical concepts from control theory, such as closed-loop stability and rational canonical form, can be employed to efficiently implement dynamic controllers over encrypted data. In particular, the proposed method eliminates the need for bootstrapping, thus significantly improving computational efficiency and taking a step towards practical implementation of encrypted control.

Bio: Yeongjun Jang received the B.S. degree in electrical and computer engineering from Seoul National University, South Korea, in 2022. He is currently a combined M.S./Ph.D. student in electrical and computer engineering at Seoul National University, South Korea. His research interests include control system security and stochastic optimal control.