Improved generic algorithms for hard knapsacks

  • Authors:
  • Anja Becker;Jean-Sébastien Coron;Antoine Joux

  • Affiliations:
  • University of Versailles Saint-Quentin-en-Yvelines;University of Luxembourg;University of Versailles Saint-Quentin-en-Yvelines and DGA

  • Venue:
  • EUROCRYPT'11 Proceedings of the 30th Annual international conference on Theory and applications of cryptographic techniques: advances in cryptology
  • Year:
  • 2011

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Abstract

At Eurocrypt 2010, Howgrave-Graham and Joux described an algorithm for solving hard knapsacks of density close to 1 in time Õ(20.337n) and memory Õ(20.256n), thereby improving a 30-year old algorithm by Shamir and Schroeppel. In this paper we extend the Howgrave-Graham-Joux technique to get an algorithm with running time down to Õ(20.291n). An implementation shows the practicability of the technique. Another challenge is to reduce the memory requirement. We describe a constant memory algorithm based on cycle finding with running time Õ(20.72n); we also show a time-memory tradeoff.