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Jung Hee Cheon (천정희)

Professor, Department of Mathematics in Seoul National University 

 

   ◉ Biography     ◉ DBLP     ◉ Google Scholar     ◉ Wikipedia     ◉ CryptoLab

 

Research Interests
◉ Fully Homomorphic Encryption     ◉ Lattice-based Cryptography
◉ Lattice Reduction Algorithm          ◉ Integer Factorization & Discrete Logarithm

 

What's new
  • Cryptanalysis on Lightweight Verifiable Homomorphic Encryption with Daehyun Jang, ASIACRYPT 2025
     
  • High-Throughput AES Transciphering using CKKS: Less than 1ms with Youngjin Bae, Minsik Kang, Taeseong Kim, WAHC'25
     
  • Grafting: Decoupled Scale Factors and Modulus in RNS-CKKS with Hyeongmin Choe, Minsik Kang, Jaehyung Kim, Seonghak Kim, Johannes Mono, Taeyeong Noh, ACM CCS 2025
     
  • OverModRaise: Reducing Modulus Consumption of CKKS Bootstrapping with Jihwan Kim, Yongdong Yeo, CiC 2025
     
  • Encryption-Friendly LLM Architecture with Donghwan Rho, Taeseong Kim, Minje Park, Jung Woo Kim, Hyunsik Chae, Ernest K Ryu, ICLR 2025

 

 

CKKS Curriculum
https://ckks.org/

- 연구실에서 중점적으로 연구하는 동형암호 CKKS 스킴에 대한 전반적인 연구들과 최신 동향을 공부합니다.

- 상황에 따라서 커리큘럼이 조금씩 달라질 수 있습니다.

 

1. Basic CKKS

   a. CKKS Scheme (eprint.iacr.org/2016/421)

   b. CKKS Bootstrapping (eprint.iacr.org/2018/153, eprint.iacr.org/2018/1043)

   c. Residue Number System (RNS) Variant CKKS (eprint.iacr.org/2018/931)

   d. Advanced RNS-CKKS (eprint.iacr.org/2019/688)

 

2. CKKS Applications

   a. Matrix Multiplication (eprint.iacr.org/2018/1041, eprint.iacr.org/2024/1284, eprint.iacr.org/2025/448)

   b. Logistic Regression (eprint.iacr.org/2018/254)

   c. Large Language Model (arxiv.org/abs/2410.02486)

 

3. Polynomial Approximation

   a. Comparison (eprint.iacr.org/2019/1234)

   b. Domain Extension Functions (eprint.iacr.org/2022/280)

   c. SoftMax (arxiv.org/abs/2410.11184)

   d. Look Up Table (eprint.iacr.org/2024/087)

 

4. Recent Researches

   a. META-BTS (eprint.iacr.org/2022/1167)

   b. HERMES (eprint.iacr.org/2023/1244)

   c. Tuple CKKS (eprint.iacr.org/2023/1788)

   d. Grafting (eprint.iacr.org/2024/1014)

 

5. Introduction to FHE

  a. FHE Survey (eprint.iacr.org/2022/1602)