Selected Working Papers

[M05]THED: Threshold Dilithium from FHE

(α-β order) Jai Hyun Park, Alain Passelègue, Damien Stehlé

pdf
[M04]Scaling up FHE-based Privacy-Preserving ML: Higher Throughput, Longer Inputs for LLama-3-8B

Jaiyoung Park*, Sejin Park, Jai Hyun Park, Jung Ho Ahn, Jung Hee Cheon, Guillaume Hanrot, Jung Woo Kim, Minje Park, Damien Stehlé

pdf
[M03]Distributed Key Generation for Efficient Threshold-CKKS

Seonhong Min*, Guillaume Hanrot, Jai Hyun Park, Alain Passelègue, Damien Stehlé

pdf
[M02]Private Database Query with SIMD-Aware Homomorphic Compression

(α-β order) Jung Hee Cheon, Keewoo Lee, Jai Hyun Park, Yongdong Yeo

pdf code

2026

[C07]Towards Lightweight CKKS: On Client Cost Efficiency

(α-β order) Jung Hee Cheon, Minsik Kang, Jai Hyun Park
ASIACCS 2026
pdf
[J05]Fast Homomorphic Linear Algebra with BLAS

(α-β order) Youngjin Bae, Jung Hee Cheon, Guillaume Hanrot, Jai Hyun Park, Damien Stehlé
Journal of Cryptology 2026
doi pdf

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

Jai Hyun Park
EUROCRYPT 2025
doi pdf blog slides video
[J04]Tree-based Lookup Table on Batched Encrypted Queries using Homomorphic Encryption

(α-β order) Jung Hee Cheon, Hyeongmin Choe, Jai Hyun Park
Journal of the Korea Mathematical Society 2025
doi pdf

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

(α-β order) Youngjin Bae, Jung Hee Cheon, Guillaume Hanrot, Jai Hyun Park, Damien Stehlé
CRYPTO 2024
doi pdf slides video

[C04]High-precision RNS-CKKS on fixed but smaller word-size architectures: theory and application

(α-β order) Rashmi Agrawal, Jung Ho Ahn, Flavio Bergamaschi, Ro Cammarota, Jung Hee Cheon, Fillipe D. M. de Souza, Huijing Gong, Minsik Kang, Duhyeong Kim, Jongmin Kim, Hubert de Lassus, Jai Hyun Park, Michael Steiner, Wen Wang
WAHC 2023
doi pdf
[C03]HERMES: Efficient Ring Packing using MLWE Ciphertexts and Application to Transciphering

(α-β order) Youngjin Bae, Jung Hee Cheon, Jaehyung Kim, Jai Hyun Park, Damien Stehlé
CRYPTO 2023
doi pdf slides video
[M01]Arithmetic PCA for Encrypted Data

(α-β order) Jung Hee Cheon, Hyeongmin Choe, Saebyul Jung, Duhyeong Kim, Dah Hoon Lee, Jai Hyun Park

pdf

[C02]Privacy-Preserving Text Classification on BERT Embeddings with Homomorphic Encryption

Garam Lee*, Minsoo Kim*, Jai Hyun Park*, Seung-won Hwang, Jung Hee Cheon
NAACL (short) 2022
doi pdf
[J03]Efficient Homomorphic Evaluation on Large Intervals

(α-β order) Jung Hee Cheon, Wootae Kim, Jai Hyun Park
TIFS 2022
doi pdf
[J02]Efficient verifiable computation over quotient polynomial rings

Jai Hyun Park*, Jung Hee Cheon, Dongwoo Kim
International Journal of Information Security 2022
doi pdf code
[J01]Secure tumor classification by shallow neural network using homomorphic encryption

Seungwan Hong*, Jai Hyun Park, Wonhee Cho, Hyeongmin Choe, Jung Hee Cheon
BMC Genomics 2022
doi pdf code

[C01]Towards a Practical Cluster Analysis over Encrypted Data

(α-β order) Jung Hee Cheon, Duhyeong Kim, Jai Hyun Park
SAC 2019
doi pdf slides code

[P04]Method for processing homomorphic encryption and electronic apparatus

(α-β order) Youngjin Bae, Jai Hyun Park

EP 4604445, granted
[P03]Electronic apparatus for bootstrap processing homomorphic encrypted messages and methods thereof

(α-β order) Jung Hee Cheon, Junyoung Jung, Taeseong Kim, Keewoo Lee, Jai Hyun Park

US 12603754, granted
[P02]Electronic device for searching encrypted data and methods thereof

(α-β order) Jung Hee Cheon, Hyeongmin Choe, Jai Hyun Park

US 12367404, granted
[P01]Apparatus for Processing Non-polynomial Operation on Homomorphic Encrypted Messages and Methods Thereof

(α-β order) Jung Hee Cheon, Wootae Kim, Jai Hyun Park

KR 10-2304992, US 11757618, JP 7449911, CN 115208548, granted