Paper 2024/709 Original: eprint.iacr.org/2024/709 ↗
Masked Computation the Floor Function and its Application to the FALCON Signature
Abstract
FALCON is candidate for standardization of the new Post Quantum Cryptography (PQC) primitives by the National Institute of Standards and Technology (NIST). However, it remains a challenge to define efficient countermeasures against side-channel attacks (SCA) for this algorithm. FALCON is a lattice-based signature that relies on rational numbers which is unusual in the cryptography field. While recent work proposed a solution to mask the addition and the multiplication, some roadblocks remain, most noticeably how to protect the floor function. We propose in this work to complete the existing first trials of hardening FALCON against SCA. We perform the mathematical proofs of our methods as well as formal security proof in the probing model using the Non-Interference concepts.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2025-08-26: last updated
- 2024-05-08: published
- Short URL
- https://ia.cr/2024/709
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2024/709,
author = {Pierre-Augustin Berthet and Justine Paillet and Cédric Tavernier},
title = {Masked Computation the Floor Function and its Application to the FALCON Signature},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/709},
year = {2024},
url = {https://eprint.iacr.org/2024/709}
}