International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Random Self-reducibility of Ideal-SVP via Arakelov Random Walks

Koen de Boer , CWI
Léo Ducas , CWI
Alice Pellet-Mary , KU Leuven
Benjamin Wesolowski , University of Bordeaux
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Conference: CRYPTO 2020
Abstract: Fixing a number field, the space of all ideal lattices, up to isometry, is naturally an Abelian group, called the *Arakelov class group*. This fact, well known to number theorists, has so far not been explicitly used in the literature on lattice-based cryptography. Remarkably, the Arakelov class group is a combination of two groups that have already led to significant cryptanalytic advances: the class group and the unit torus. In the present article, we show that the Arakelov class group has more to offer. We start with the development of a new versatile tool: we prove that, subject to the Riemann Hypothesis for Hecke L-functions, certain random walks on the Arakelov class group have a rapid mixing property. We then exploit this result to relate the average-case and the worst-case of the Shortest Vector Problem in ideal lattices. Our reduction appears particularly sharp: for Hermite-SVP in ideal lattices of certain cyclotomic number fields, it loses no more than a $\tilde O(\sqrt n)$ factor on the Hermite approximation factor. Furthermore, we suggest that this rapid-mixing theorem should find other applications in cryptography and in algorithmic number theory.
Video from CRYPTO 2020
  title={Random Self-reducibility of Ideal-SVP via Arakelov Random Walks},
  author={Koen de Boer and Léo Ducas and Alice Pellet-Mary and Benjamin Wesolowski},