[Resource Topic] 2011/474: Improved Generic Algorithms for Hard Knapsacks

Welcome to the resource topic for 2011/474

Title:
Improved Generic Algorithms for Hard Knapsacks

Authors: Anja Becker, Jean-Sébastien Coron, Antoine Joux

Abstract:

At Eurocrypt 2010, Howgrave-Graham and Joux described an algorithm for solving hard knapsacks of density close to 1 in time O(2^0.337n) and memory O(2^0.256n), 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 O(2^0.291n). 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 O(2^0.72n); we also show a time-memory tradeoff.

ePrint: https://eprint.iacr.org/2011/474

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