Improved hardness results for unique shortest vector problem

Divesh Aggarwal; Chandan Dubey

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arXiv · 1112.1564

Improved hardness results for unique shortest vector problem

Divesh Aggarwal·Chandan Dubey

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Abstract

We give several improvements on the known hardness of the unique shortest vector problem. - We give a deterministic reduction from the shortest vector problem to the unique shortest vector problem. As a byproduct, we get deterministic NP-hardness for unique shortest vector problem in the $\ell_\infty$ norm. - We give a randomized reduction from SAT to uSVP_{1+1/poly(n)}. This shows that uSVP_{1+1/poly(n)} is NP-hard under randomized reductions. - We show that if GapSVP_γ\in coNP (or coAM) then uSVP_{\sqrtγ} \in coNP (coAM respectively). This simplifies previously known uSVP_{n^{1/4}} \in coAM proof by Cai \cite{Cai98} to uSVP_{(n/\log n)^{1/4}} \in coAM, and additionally generalizes it to uSVP_{n^{1/4}} \in coNP. - We give a deterministic reduction from search-uSVP_γto the decision-uSVP_{γ/2}. We also show that the decision-uSVP is {\bf NP}-hard for randomized reductions, which does not follow from Kumar-Sivakumar \cite{KS01}.

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Divesh Aggarwal, Chandan Dubey. 2011-12-07. Improved hardness results for unique shortest vector problem. https://arxiv.org/abs/1112.1564

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