Threshold Dilithium from FHE [M05]

• (Jun 2026) Invited talk at PACOH Workshop, Korea
• (Feb 2026) Invited talk at Seoul National University, Korea

Ciphertext-Ciphertext Matrix Multiplication: Fast for Large Matrices [C06]

• (Nov 2025) Invited talk at NTNU, Norway
• (Jun 2025) Invited Talk at FHE.org, Virtual [slides] [video]
• (May 2025) EUROCRYPT 2025, Madrid, Spain [slides] [video]
• (Feb 2025) Invited talk at Seoul National University, Virtual

Plaintext-Ciphertext Matrix Multiplication and FHE Bootstrapping: Fast and Fused [C05]

• (Feb 2025) Invited talk at École polytechnique, France
• (Aug 2024) CRYPTO 2024, UC Santa Barbara, USA [slides] [video]

HERMES: Efficient Ring Packing using MLWE Ciphertexts and Application to Transciphering [C03]

• (Dec 2023) Invited talk at Dongguk University, Korea
• (Aug 2023) CRYPTO 2023, UC Santa Barbara, USA [slides] [video]

Tree-based Lookup Table on Batched Encrypted Queries using Homomorphic Encryption [J04]

• (Apr 2022) 2022 KMS Spring Meeting, Virtual

Efficient Homomorphic Evaluation on Large Intervals [J03]

• (Oct 2020) 2020 KMS Fall Meeting, Virtual

Towards a Practical Cluster Analysis over Encrypted Data [C01]

• (Oct 2019) 2019 KMS Fall Meeting, Hong-ik University, Korea
• (Aug 2019) SAC 2019, University of Waterloo, Canada [slides]

ENS de Lyon

• (Fall 2025) Privacy-preserving Machine Learning with Homomorphic Encryption (M2)
• Co-instructor with Guillaume Hanrot.
• (Fall 2024) Fully Homomorphic Encryption (M2)
• Co-instructor with Alain Passelègue and Damien Stehlé.

FHE School

Jan 2025

• Delivered 9 invited lectures on fully homomorphic encryption over a 3-week program.

Seoul National University (TA)

• (Spring 2023) Computational Number Theory
• (Spring 2021) Number Theory
• (Spring 2020 – Spring 2023) Differential and Integral Calculus

Korea Cryptography Contest

• (Nov 2024) Special Prize for [C07]
• (Oct 2023) Best Award for [C03]; Special Prize for [M02]
• (Oct 2022) Encouragement Prize for [M01]
• (Oct 2020) Excellence Award for [J03]

BK 21+ Scholarship

Mar 2020 – Aug 2023

First Place Prize, iDASH Genomic Data Privacy and Security Protection Competition

Dec 2020

• Track I: Secure multi-label Tumor classification using Homomorphic Encryption

Award for Excellence in Teaching

Sep 2020

• For teaching Differential and Integral Calculus

The Presidential Science Scholarship

Mar 2013 – Feb 2019

Journal Reviewer

• Journal of Cryptology (JoC); Design, Codes and Cryptography (DCC); Information Sciences; IEEE Access

Conference External Reviwer

• ASIACRYPT 2026, 2025, 2022, 2021; CRYPTO 2026; EUROCRYPT 2026, 2025, 2024, 2023; STOC 2026; TCC 2025; PQCrypto 2023; FHE.org 2022; ANTS 2020