Author

Yanbin Pan

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Preprint Sep 2026

SVP Is NP-Hard for Some Rank-2 Cyclotomic Modules

Let $q$ range over primes congruent to $3$ modulo $4$. Let $\zeta_q$ be a primitive $q$th root of unity, and put $K=\mathbb{Q}(\zeta_q)$, with ring of integers $\mathcal{O}_K=\mathbb{Z}[\zeta_q]$. We prove that the decision version of the Shortest Vector Problem ($\mathrm{SVP}$) in the $\ell_2$-norm is $\mathrm{NP}$-co...

Jia-Qi Liu, Yansong Feng, Yanbin Pan · 2 citations

Preprint Aug 2026

CVP Is NP-Complete for Principal Cyclotomic Ideals

We prove that exact Euclidean decision-CVP is $\mathsf{NP}$-complete on the coefficient lattices of nonzero principal ideals in the power-of-two cyclotomic rings $R_d:=\mathbb{Z}[y]/(y^d+1)$. Our deterministic reduction from Exact Cover by 3-Sets (X3C) produces a target and a squared threshold $\Delta$ such that the cl...

Jia-Qi Liu, Yansong Feng, Yanbin Pan · 2 citations