Author

Chang-Min Lee

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Preprint Sep 2026

Adelic reduction of module lattices

We give a strict generalization of the LLL algorithm over number fields, based on the reduction theory of $\GL(n)$ over the adele ring of a number field. Our algorithm is free of heuristics, with rigorous bounds on output quality and complexity. As a consequence, we obtain a hierarchy of reductions from module-(H)SVP t...

Henry Bambury, Seungki Kim, Chang-Min Lee et al. · 0 citations

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