Keewoo Lee

I am a postdoctoral researcher studying cryptography at UC Berkeley, hosted by Prof. Sanjam Garg. I obtained my Ph.D. in Mathematical Sciences at Seoul National University, advised by Prof. Jung Hee Cheon.

I am broadly interested in cryptography from theory to practice. Currently, my research focus is on cryptographic primitives for secure computation (e.g., homomorphic encryption, secure multiparty computation) and their applications (e.g., private database query, privacy-preserving machine learning).

news

Nov 2024	[ Paper ] The paper “SophOMR: Improved Oblivious Message Retrieval from SIMD-Aware Homomorphic Compression” is now available on ePrint.
Sep 2024	[ Service ] I will be joining the editorial board of IACR CiC 2025.
Aug 2024	[ Paper ] The paper “SIMD-Aware Homomorphic Compression and Application to Private Database Query” is now available on arXiv.
Jun 2024	[ Award ] I have been awarded the Sejong Science Fellowship (~$50000/yr) for 2024-2025 academic year, the most prestigious program for Korean postdocs in STEM fields.
Apr 2024	[ Award ] My thesis “A Study on Homomorphic Packing: Definitions, Constructions, and Limitations” received Best Doctoral Dissertation Award ($2000) from College of Natural Sciences @ SNU and Best Doctoral Dissertation Award ($1000) from the Korean Mathematical Society.
Mar 2024	[ Paper ] The paper “Bit Security as Cost to Demonstrate Advantage” is accepted to IACR CiC.
Sep 2023	[ Paper ] The paper “VeriSimplePIR: Verifiability in SimplePIR at No Online Cost for Honest Servers” is accepted to USENIX Security 2024.
Jun 2022	[ Paper ] I will be presenting our paper “Limits of Polynomial Packings for $\mathbb{Z}_{p^k}$ and $\mathbb{F}_{p^k}$” at Eurocrypt 2022 (Trondheim, Norway). The session will be at Jun 2nd 9:00~10:15 CEST.
Aug 2021	[ Paper ] I will be presenting our paper “MHz2k: MPC from HE over Z2k” at Crypto 2021. The live session will be at Aug 20th 15:00~15:50 UTC. The pre-recorded video is now on youtube.