[Resource Topic] 2018/146: Polynomial Time Bounded Distance Decoding near Minkowski’s Bound in Discrete Logarithm Lattices

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Title:
Polynomial Time Bounded Distance Decoding near Minkowski’s Bound in Discrete Logarithm Lattices

Authors: Léo Ducas, Cécile Pierrot

Abstract:

We propose a concrete family of dense lattices of arbitrary dimension n in which the lattice Bounded Distance Decoding (BDD) problem can be solved in deterministic polynomial time. This construction is directly adapted from the Chor-Rivest cryptosystem (1988). The lattice construction needs discrete logarithm computations that can be made in deterministic polynomial time for well-chosen parameters. Each lattice comes with a deterministic polynomial time decoding algorithm able to decode up to large radius. Namely, we reach decoding radius within O(log n) Minkowski’s bound, for both l1 and l2 norms.

ePrint: https://eprint.iacr.org/2018/146

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