Lattice Basis Reduction in Infinity Norm - Technische Universität ...
Lattice Basis Reduction in Infinity Norm - Technische Universität ...
Lattice Basis Reduction in Infinity Norm - Technische Universität ...
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Contents<br />
1 Introduction 1<br />
2 Mathematical Background 3<br />
2.1 Basic Def<strong>in</strong>itions . . . . . . . . . . . . . . . . . . . . . . . . . 3<br />
2.2 <strong>Lattice</strong>s and Successive M<strong>in</strong>ima . . . . . . . . . . . . . . . . . 4<br />
2.3 Distance Functions . . . . . . . . . . . . . . . . . . . . . . . . 6<br />
3 Gauss’ Algorithm 8<br />
3.1 Gauss - reduced Bases . . . . . . . . . . . . . . . . . . . . . . 8<br />
3.2 Gauss Algorithm with Euclidean <strong>Norm</strong> . . . . . . . . . . . . . 9<br />
3.3 Generalized Gauss Algorithm . . . . . . . . . . . . . . . . . . 9<br />
3.4 Inf<strong>in</strong>ity <strong>Norm</strong> Algorithm . . . . . . . . . . . . . . . . . . . . . 10<br />
3.5 Time Bounds . . . . . . . . . . . . . . . . . . . . . . . . . . . 12<br />
4 LLL 14<br />
4.1 LLL-reduced <strong>Basis</strong> . . . . . . . . . . . . . . . . . . . . . . . . 14<br />
4.2 LLL Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
4.3 LS Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . 17<br />
4.4 Comput<strong>in</strong>g the Distance Functions <strong>in</strong> Inf<strong>in</strong>ity <strong>Norm</strong> . . . . . 18<br />
4.5 Time Bounds . . . . . . . . . . . . . . . . . . . . . . . . . . . 19<br />
5 Block-Kork<strong>in</strong>e-Zolotarev Algorithm 21<br />
5.1 BKZ-reduced lattice basis . . . . . . . . . . . . . . . . . . . . 21<br />
5.2 BKZ Algorithm with Euclidean <strong>Norm</strong> . . . . . . . . . . . . . 22<br />
5.3 BKZ Algorithm with an Arbitrary <strong>Norm</strong> . . . . . . . . . . . . 25<br />
5.4 Enumeration for Inf<strong>in</strong>ity <strong>Norm</strong> . . . . . . . . . . . . . . . . . 28<br />
5.5 Time Bounds . . . . . . . . . . . . . . . . . . . . . . . . . . . 29<br />
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