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Bennett, Huck; Stephens-Davidowitz, Noah; Golovnev, Alexander
2017 IEEE 58th Annual Symposium on Foundations of Computer Science (FOCS), 2017-Oct.Conference Proceeding
For odd integers p ≥ 1 (and p = ∞), we show that the Closest Vector Problem in the ℓ p norm (CVP p ) over rank n lattices cannot be solved in 2 (1-ε)n time for any constant ε > 0 unless the Strong Exponential Time Hypothesis (SETH) fails. We then extend this result to "almost all" values of p ≥ 1, not including the even integers. This comes tantalizingly close to settling the quantitative time complexity of the important special case of CVP 2 (i.e., CVP in the Euclidean norm), for which a 2 n+o(n) -time algorithm is known. In particular, our result applies for any p = p(n) ≠ 2 that approaches 2 as n → ∞. We also show a similar SETH-hardness result for SVP ∞ ; hardness of approximating CVP p to within some constant factor under the so-called Gap-ETH assumption; and other hardness results for CVP p and CVPP p for any 1 ≤ p <; ∞ under different assumptions.
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