SCIENCE CHINA Information Sciences, Volume 61, Issue 3: 032115(2018) https://doi.org/10.1007/s11432-017-9307-0

## Orthogonalized lattice enumeration for solving SVP

• AcceptedNov 30, 2017
• PublishedJan 17, 2018
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### Abstract

The orthogonalized integer representation wasindependently proposed by Ding et al. using genetic algorithm and Fukase et al. using sampling technique to solve shortest vector problem (SVP).Their results are promising.In this paper, we consider sparse orthogonalized integer representations for shortest vectors and propose a new enumeration method,called orthognalized enumeration, by integratingsuch a representation. Furthermore, we present a mixed BKZ method, called MBKZ, by alternately applying orthognalized enumeration andother existing enumeration methods. Compared to the existing ones,our methods have greater efficiency and achieve exponential speedups both in theory and in practice for solving SVP.Implementations of our algorithms have been tested to be effective in solving challenging lattice problems.

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• Table 1   MBKZ's results in solving SVP challenge
 Dimension Previous norm Our results CPU used CPU frequency 2635 (seed 997) 3 CPUs respectively 99 2642 (seed 0) 2606 (seed 998) running in seed 2.5 GHz 2604 (seed 999) 997998 and 999 2655 (seed 997) 3 CPUs respectively 105 2659 (seed 0) running in seed 2.5 GHz 2643 (seed 997) 997998 and 999 3 CPUs respectively 113 2804 (seed 0) 2739 (seed 999) running in seed 2.5 GHz 997998 and 999 2921 (seed 72) 100 CPUs respectively 121 – running in seed 2.93 GHz 2910 (seed 62) 0,1,…,99

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