2log1-ε n hardness for the closest vector problem with preprocessing

  • Authors:
  • Subhash A. Khot;Preyas Popat;Nisheeth K. Vishnoi

  • Affiliations:
  • New York University, New York, NY, USA;New York University, New York, NY, USA;Microsoft Research, Bangalore, India

  • Venue:
  • STOC '12 Proceedings of the forty-fourth annual ACM symposium on Theory of computing
  • Year:
  • 2012
  • Universal factor graphs

    ICALP'12 Proceedings of the 39th international colloquium conference on Automata, Languages, and Programming - Volume Part I

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Abstract

We prove that for an arbitrarily small constant ε0, assuming NP⊈ DTIME (2logO 1-ε n), the preprocessing versions of the closest vector problem and the nearest codeword problem are hard to approximate within a factor better than 2log1-ε n. This improves upon the previous hardness factor of (log n)δ for some δ0 due to [AKKV05].