Author

Jiseung Kim

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Preprint Oct 2026

Regular Syndrome Decoding Is Easier Than Previously Estimated

The Regular Syndrome Decoding (RSD) problem is a structured variant of classical Syndrome Decoding and underlies a growing number of efficient cryptographic constructions, including zero knowledge protocols, pseudorandom correlation generators, and MPC in the Head signatures. Although RSD is generally believed to be co...

Jiseung Kim, Minkyu Kim, Chang-Min Lee et al. · 0 citations

Preprint Oct 2026

Reaction Attack on CKKS Deployments with Asymptotically Optimal Query Complexity

We study a protocol-level reaction leakage in CKKS deployments where public coefficient-to-slot (C2S) evaluation keys are combined with a client's 1-bit validity response. Under this deployment surface, a malicious evaluator can recover a ternary secret key using asymptotically optimal $O(H)$ reaction queries, where $H...

S. Bian, Hyeong-Soon Choe, Jiseung Kim et al. · 0 citations

Open access Sep 2026

Enhanced private set union from secret-shared private membership test

This work introduces a new PSU protocol that is simple, efficient, and secure against known during-execution leakage and hashing-related leakage without relying on Cuckoo Hashing, and achieves linear complexity.

Sang-Min Lee, Jiseung Kim, Yong-Ha Son · Scientific Reports · 0 citations