### High-order Table-based Conversion Algorithms and Masking Lattice-based Encryption

Jean-Sébastien Coron, François Gérard, Simon Montoya, and Rina Zeitoun

##### Abstract

Masking is the main countermeasure against side-channel attacks on embedded devices. For cryptographic algorithms that combine Boolean and arithmetic masking, one must therefore convert between the two types of masking, without leaking additional information to the attacker. In this paper we describe a new high-order conversion algorithm between Boolean and arithmetic masking, based on table recomputation, and provably secure in the ISW probing model. We show that our technique is particularly efficient for masking structured LWE encryption schemes such as Kyber and Saber. In particular, for Kyber IND-CPA decryption, we obtain an order of magnitude improvement compared to existing techniques.

Available format(s)
Category
Implementation
Publication info
Preprint. Minor revision.
Keywords
High-order maskinglattice-based cryptographyconversion algorithms
Contact author(s)
jscoron @ gmail com
History
2021-12-09: last of 2 revisions
See all versions
Short URL
https://ia.cr/2021/1314

CC BY

BibTeX

@misc{cryptoeprint:2021/1314,
author = {Jean-Sébastien Coron and François Gérard and Simon Montoya and Rina Zeitoun},
title = {High-order Table-based Conversion Algorithms and Masking Lattice-based Encryption},
howpublished = {Cryptology ePrint Archive, Paper 2021/1314},
year = {2021},
note = {\url{https://eprint.iacr.org/2021/1314}},
url = {https://eprint.iacr.org/2021/1314}
}

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