The Shortest Vector in a Lattice is Hard to Approximate to within Some Constant

  • Authors:
  • Daniele Micciancio

  • Affiliations:
  • -

  • Venue:
  • FOCS '98 Proceedings of the 39th Annual Symposium on Foundations of Computer Science
  • Year:
  • 1998

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Abstract

We show the shortest vector problem in the l_2 norm is NP-hard (for randomized reductions) to approximate within any constant factor less than sqrt(2). We also give a deterministic reduction under a reasonable number theoretic conjecture. Analogous results hold in any l_p norm (p=1). In proving our NP-hardness result, we give an alternative construction satisfying Ajtai's probabilistic variant of Sauer's lemma, that greatly simplifies Ajtai's original proof.