[Resource Topic] 2015/211: Faster sieving for shortest lattice vectors using spherical locality-sensitive hashing

Welcome to the resource topic for 2015/211

Title:
Faster sieving for shortest lattice vectors using spherical locality-sensitive hashing

Authors: Thijs Laarhoven, Benne de Weger

Abstract:

Recently, it was shown that angular locality-sensitive hashing (LSH) can be used to significantly speed up lattice sieving, leading to a heuristic time complexity for solving the shortest vector problem (SVP) of 2^{0.337n + o(n)} (and space complexity 2^{0.208n + o(n)}. We study the possibility of applying other LSH methods to sieving, and show that with the spherical LSH method of Andoni et al.\ we can heuristically solve SVP in time 2^{0.298n + o(n)} and space 2^{0.208n + o(n)}. We further show that a practical variant of the resulting SphereSieve is very similar to Wang et al.'s two-level sieve, with the key difference that we impose an order on the outer list of centers.

ePrint: https://eprint.iacr.org/2015/211

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