Hello, I'm
Jeongeun Park
Given name in Hangeul :정은 (ʣʌŋɯn in IPA)
Given name in Hangeul :정은 (ʣʌŋɯn in IPA)
MY BACKGROUND
I've been studying lattice based cryptography based on mathematical background. In particular, homomorphic encryption and its applications in both theoretical and practical way are my main topics. I'm also interested in various lattice based crypto primitives such as digital signature and key exchange protocols.
I'm always ready to study with professional research teams for interesting and motivating topics based on my subjects. Browse my site to see all that I have to offer.
B.S in Mathematics.
Ewha Womans University, Republic of Korea
PhD in Mathematics with a specialization in Cryptology.
Ewha Womans University
Now I'm an associate professor
at the Department of Information Security and Communication Technology,
Norwegian University of Science and Technology (NTNU)
email: jungeun7430@gmail.com
jeongeun.park@ntnu.no
WHAT I’VE LEARNED
2015.03–2021.02
Combined master-doctoral course in Cryptology,
Ewha Womans University, Seoul, Republic Of Korea
Advisor: Hyang-Sook Lee
2010.03–2015.02
Bachelor of Science in Mathematics,
Ewha Womans University, Seoul, Republic Of Korea
WHERE I’VE WORKED
April 2024- Present
Associate professor at the Department of Information Security and Communication Technology, NTNU, Norway
April 2021- Mar 2024
Postdoctoral fellowship at COSIC, KU Leuven, Belgium
hosted by Nigel Smart
Oct 2018- Mar 2019
Internship Program at NTT corporation
Tokyo, Japan
Advisor: Mehdi Tibouchi
The order of author names is in the alphabetical order .
2024
FINALLY: A Multi-Key FHE Scheme Based on NTRU and LWE, joint work with Barry Van Leeuwen and Oliver Zajonc -Communications in Cryptology, Volume 1, Issue 3 (2024)
Faster Private Decision Tree Evaluation for Batched Input from Homomorphic Encryption, joint work with Kelong Cong, Jiayi Kang, and Georgio Nicolas -SCN 2024
NTRU-based FHE for Larger Key and Message Space, joint work with Robin Jadoul, Axel Mertens, and Hilder V. L. Pereira - ACISP 2024
Panacea: Non-interactive and Stateless Oblivious RAM, joint work with Kelong Cong, Debajyoti Das, and Georgio Nicolas, - Euro S&P 2024
Revisiting Oblivious Top-k Selection with Applications to Secure k-NN Classification, joint work with Kelong Cong, Robin Geelen, and Jiayi Kang - SAC 2024
Towards Practical Transciphering for FHE with Setup Independent of the Plaintext Space, joint work with Pierrick Méaux and Hilder V. L. Pereira
- Communications in Cryptology, Volume 1, Issue 1 (2024)
2023
Efficient TFHE Bootstrapping in the Multiparty Setting, joint work with Sergi Rovira, - IEEE Access, Vol. 11, pp. 118625 - 118638 (2023), Oct
Practical Randomized Lattice Gadget Decomposition With Application to FHE, joint work with Sohyun Jeon and Hyang-Sook Lee, -ESORICS 2023
Poster: Panacea --- Stateless and Non-Interactive Oblivious RAM, joint work with Kelong Cong, Debajyoti Das, and Georgio Nicolas, ACM CCS 2023
2022
FINAL: Faster FHE instantiated with NTRU and LWE, joint work with Charlotte Bonte, Ilia Iliashenko, Hilder V. L. Pereira, and Nigel P. Smart, -ASIACRYPT 2022
On Pairwise Gaussian bases and LLL algorithm for three dimensional lattices, joint work with Kitae Kim, Hyang-Sook Lee, Seongan Lim, and Ikkwon Yie, -Journal of Korean Mathematical Society, Vol. 59, pp. 1047-1065 (2022), Nov
SortingHat: Efficient Private Decision Tree Evaluation via Homomorphic Encryption and Transciphering, joint work with Kelong Cong, Debajyoti Das, and Hilder V. L. Pereira, -ACM CCS 2022
2021
Homomorphic Encryption for Multiple Users with Less Communications, (single-authored paper) -IEEE Access, Vol 9, pp. 135915-135926 (2021), Oct
Efficient Lattice Gadget Decomposition Algorithm with Bounded Uniform Distribution, joint work with Sohyun Jeon and Hyang-Sook Lee - IEEE Access , Vol. 9, pp. 17429-17437 (2021), Jan
SHECS-PIR: Somewhat Homomorphic Encryption-based Compact and Scalable Private Information Retrieval, joint work with Mehdi Tibouchi - ESORICS 2020
Towards Round-Optimal Secure Multiparty Computations: Multikey FHE without a CRS, joint work with Eunkyung Kim and Hyang-Sook Lee - International Journal of Foundations of Computer Science, Vol. 31, pp. 157-174 (2020), Feb
On the Security of Multikey Homomorphic Encryption, joint work with Hyang-Sook Lee - IMACC 2019
Towards Round-Optimal Secure Multiparty Computations: Multikey FHE without a CRS, joint work with Eunkyung Kim and Hyang-Sook Lee - ACISP 2018
sPAR:(Somewhat) Practical Anonymous Router - joint work with Debajyoti Das
Private Information Retrieval based on Homomorphic Encryption, Revisited - joint work with Jaeseon Kim and Hyewon Sung
Special Award, Crypto Contest, Korea Cryptography Forum 2017
Research Assistant in the Project from the National Research Foundation of Korea (NRF) funded by the Ministry of Science ICT and Future Planning 2015-2018
Brain Korea 21 Plus (BK21 Plus) Scholarship, 2015-2016.2018,2020
Research Assistant in the Project from the National Research Foundation of Korea (NRF) funded by the Korea Government(MSIT), 2018-2021. Feb
Lattice based cryptography
Homomorphic encryption
Privacy Preserving Protocols
PC member of PETS 2026
Program chair of ISC 2025
Organizing committee & PC member of IMPACT 2025
PC member of PETS 2025, EuroS&P 2025, IACR CiC 2025, CANS 2025, CFAIL2025
PC member of WAHC 2023
Program chair of CFAIL 2023
PC member of FHE.org conference 2023
a reviewer for Mathematical Reviews
Reviewed papers of IEEE S&P, PKC, TCHES, SCN in 2024
Reviewed papers of IEEE Transactions on Dependable and Secure Computing, Asiacrypt, TCHES, ISC in 2023
Reviewed papers of Journal of Cryptology, Asiacrypt, ACNS, SCN in 2022
Reviewed papers of Asiacrypt, Eurocrypt, ESORICS in 2021
Keynote talk about Fully Homomorphic Encryption — What, Why, and How?, AfricaCrypt 2025, Morocco, July 2025
Invited talk about FHE-based Transciphering, MOZAIK Winter School, Belgium, April 2025
Invited talk about Towards practical FHE :current challenges and solutions, Simula UiB, Norway, Nov 2024
Invited talk about Pancea: Non-interactive and Stateless Oblivious RAM, National Security Research Institute(NSR), Korea , July 2023.
Invited talk about Pancea: Non-interactive and Stateless Oblivious RAM, EWHA-KMS International Workshop on Cryptography, Korea , July 2023.
Invited talk about FHE and its applications, Joint workshop by Nokia Bell Labs + DistriNet + COSIC, June 2023.
Invited talk about Pancea: Non-interactive and Stateless Oblivious RAM, Inria Rennes, June 2023.
Invited lecture on Applications of FHE in The 3rd ISC Winter School on Cryptography, Mar 2023.
Invited talk about Homomorphic encryption and its applications to a privacy preserving machine learning algorithm in Ewha Womans University, Korea , Dec 2022
Invited talk about Homomorphic encryption and its applications to a privacy preserving machine learning algorithm in Chung-Ang University, Korea, Dec 2022
Invited talk about FHE based on NTRU: challenges and solutions in Chung-Ang University, Korea , Nov 2022