About me

I am a security engineer of confidential computing & storage security in SW development team at Samsung Electronics, Korea. My major research topics are fully homomorphic encryption (FHE) and post-quantum cryptography (PQC), and cryptanalysis.

I completed my PhD in 2024 at Seoul National University (SNU), where I was advised by Prof. Jung Hee Cheon. In 2017, I graduated with Higest Honors from SNU where I majored in Mathematical Sciences and Economics.

News and Upcoming Events

• [Dec, 2024] The paper [CCK24] with the title “Improved Universal Thresholdizer from Iterative Shamir Secret Sharing” is accepted in Journal of Cryptology!

• [Nov, 2024] The paper [CHK+24] with the title “Fast and accurate homomorphic softmax evaluation” is presented in ACM CCS 2024.

• [Jun, 2024] The paper [KC24] with the title “Accelerating Homomorphic Comparison Operations for Thresholding Using an Asymmetric Input Range and Input Scaling” is presented in GLSVLSI 2024.

• [Mar, 2024] I started working as a full-time engineer at Samsung Electronics in Korea.

• [Nov, 2023] The paper [CCK+23] with the title “Homomorphic Multiple Precision Multiplication for CKKS and Reduced Modulus Consumption” is presented in ACM CCS 2023.

• [Dec, 2022] The paper [HPC+22] with the title “Secure Tumor Classification by Shallow Neural Network Using Homomorphic Encryption” is published to BMC Medical Genomics.

• [Nov, 2022] I presented the paper [BCC+22] at ACM CCS 2022 under the title “Meta-bts: Bootstrapping precision beyond the limit”.

• [Nov, 2021] The paper [KHB+21] with the title “Ultrafast homomorphic encryption models enable secure outsourcing of genotype imputation” is published to Cell systems.

• [May, 2021] I presented the paper [CCKK21] at PKC 2021 under the title “Adventures in crypto dark matter: attacks, fixes and analysis for weak pseudorandom functions”.

• [Dec, 2020] My SNU team was chosen as one of the first winners of Track 1 in iDASH 2020 competition. (link)