Jiseung Kim

I am an Associate Professor in the Department of Computer Science and Artificial Intelligence at Jeonbuk National University (JBNU). I received my Ph.D. in Mathematical Sciences from Seoul National University, advised by Jung Hee Cheon. Before joining JBNU, I was a Research Fellow at the Korea Institute for Advanced Study (KIAS), hosted by Jeong Han Kim.

My research focuses on cryptography, with emphasis on:

Mathematical cryptanalysis: attacks on lattice-based and number-theoretic assumptions
Secure computation: threshold FHE, multi-party computation, private set operations

I am looking for motivated graduate students interested in cryptography. If you are interested, please contact me via email.

News

Sep, 2026	Our paper “Reduce and Prange: Revisiting Prange’s ISD for Solving SD/RSD over Large Fields” has been accepted to IEEE Transactions on Information Theory.
Sep, 2026	Our paper “Reaction Attack on CKKS Deployments with Asymptotically Optimal Query Complexity” has been accepted to IEEE S&P 2027.
Sep, 2026	Our paper “Enhanced Private Set Union from Secret-Shared Private Membership Test” has been accepted to Scientific Reports.
Aug, 2026	Our paper “CCA2 Attacks on the Revocable Policy Hiding Bilateral Access Control Scheme With Equality Test for IIoT Environment” has been accepted to IEEE Internet of Things Journal.
Aug, 2026	Our paper “Key Recovery of the Edge-Based Quantum-Secure Fully Homomorphic Encryption Scheme” has been accepted to IEEE Transactions on Consumer Electronics.

Selected Publications

Authors are listed in alphabetical order unless marked with *.

S&P

Reaction Attack on CKKS Deployments with Asymptotically Optimal Query Complexity

Song Bian, Hyeongmin Choe, Jiseung Kim, and Changmin Lee

In IEEE Symposium on Security and Privacy (S&P), 2027

To appear

Bib

@inproceedings{BCKL27sp,
  title = {Reaction Attack on CKKS Deployments with Asymptotically Optimal Query Complexity},
  author = {Bian, Song and Choe, Hyeongmin and Kim, Jiseung and Lee, Changmin},
  booktitle = {IEEE Symposium on Security and Privacy (S&P)},
  year = {2027},
  note = {To appear},
}

T-IT

Reduce and Prange: Revisiting Prange’s ISD for Solving SD/RSD over Large Fields

Jiseung Kim and Changmin Lee

IEEE Transactions on Information Theory, 2026

To appear

Bib

@article{KL26it,
  title = {Reduce and Prange: Revisiting Prange's ISD for Solving SD/RSD over Large Fields},
  author = {Kim, Jiseung and Lee, Changmin},
  journal = {IEEE Transactions on Information Theory},
  year = {2026},
  note = {To appear},
}

CCS

Revisiting Shamir Secret Sharing for Threshold Fully Homomorphic Encryption

Jiseung Kim, Seunghu Kim, and Hyung Tae Lee

In ACM Conference on Computer and Communications Security (CCS), 2026

To appear

Bib

@inproceedings{KKL26ccs,
  title = {Revisiting Shamir Secret Sharing for Threshold Fully Homomorphic Encryption},
  author = {Kim, Jiseung and Kim, Seunghu and Lee, Hyung Tae},
  booktitle = {ACM Conference on Computer and Communications Security (CCS)},
  year = {2026},
  note = {To appear},
}

S&P

From Perfect to Approximate Hints: Efficient LWE Secret Recovery Leveraging Low Hamming Weight

Minki Hhan, Ga Hee Hong, Jiseung Kim, Changmin Lee, and Jeonghwan Lee

In IEEE Symposium on Security and Privacy (S&P), 2026

Bib

@inproceedings{HHKLL26sp,
  title = {From Perfect to Approximate Hints: Efficient LWE Secret Recovery Leveraging Low Hamming Weight},
  author = {Hhan, Minki and Hong, Ga Hee and Kim, Jiseung and Lee, Changmin and Lee, Jeonghwan},
  booktitle = {IEEE Symposium on Security and Privacy (S&P)},
  year = {2026},
}

JoC

Improved Universal Thresholdizer from Iterative Shamir Secret Sharing

Jung Hee Cheon, Wonhee Cho, and Jiseung Kim

Journal of Cryptology, 2025

Bib

@article{CCK25joc,
  title = {Improved Universal Thresholdizer from Iterative Shamir Secret Sharing},
  author = {Cheon, Jung Hee and Cho, Wonhee and Kim, Jiseung},
  journal = {Journal of Cryptology},
  year = {2025},
}

PKC

Adventures in Crypto Dark Matter: Attacks and Fixes for Weak Pseudorandom Function

Jung Hee Cheon, Wonhee Cho, Jeong Han Kim, and Jiseung Kim

In International Conference on Practice and Theory of Public-Key Cryptography (PKC), 2021

Bib

@inproceedings{CCKK21pkc,
  title = {Adventures in Crypto Dark Matter: Attacks and Fixes for Weak Pseudorandom Function},
  author = {Cheon, Jung Hee and Cho, Wonhee and Kim, Jeong Han and Kim, Jiseung},
  booktitle = {International Conference on Practice and Theory of Public-Key Cryptography (PKC)},
  year = {2021},
}

CRYPTO

Statistical Zeroizing Attack: Cryptanalysis of Candidates of BP Obfuscation over GGH15 Multilinear Map

Jung Hee Cheon, Wonhee Cho, Minki Hhan, Jiseung Kim, and Changmin Lee

In Annual International Cryptology Conference (CRYPTO), 2019

Bib

@inproceedings{CCHKL19crypto,
  title = {Statistical Zeroizing Attack: Cryptanalysis of Candidates of BP Obfuscation over GGH15 Multilinear Map},
  author = {Cheon, Jung Hee and Cho, Wonhee and Hhan, Minki and Kim, Jiseung and Lee, Changmin},
  booktitle = {Annual International Cryptology Conference (CRYPTO)},
  year = {2019},
}

CRYPTO

Cryptanalyses of Branching Program Obfuscations over GGH13 Multilinear Map from the NTRU Problem

Jung Hee Cheon, Minki Hhan, Jiseung Kim, and Changmin Lee

In Annual International Cryptology Conference (CRYPTO), 2018

Bib

@inproceedings{CHKL18crypto,
  title = {Cryptanalyses of Branching Program Obfuscations over GGH13 Multilinear Map from the NTRU Problem},
  author = {Cheon, Jung Hee and Hhan, Minki and Kim, Jiseung and Lee, Changmin},
  booktitle = {Annual International Cryptology Conference (CRYPTO)},
  year = {2018},
}