Verfahren zum Schutz vor Fehlerangriffen und zur Ausführung einer Erzeugung einer Kristall-Dilithium-Signatur

Details

Veröffentlichungs-Nr.

EP4668665

Aktenzeichen

EP24305976

Anmeldetag

20. Juni 2024

Veröffentlichung

24. Dezember 2025

Rechtsraum

EP

IPC

H04L9/00H04L9/30

Abstract

The invention relates to methods, and associated devices, for protecting the execution of the generation of a Crystals-Dilithium digital signature σ of a message M with a secret key sk against attacks exploiting invalid signatures content by fault attacks. In order to prevent an attacker bypassing by fault injection attacks tests on a second test vector r 0 / r 0 ∼ <img class="EMIRef" id="4b8adde5-5057-48cf-8736-124ff75a8c68-ia01" /> from obtaining invalid signatures as outputs of the signature generation algorithm, the invention modifies the norm check performed on the second test vector r 0 / r 0 ∼ <img class="EMIRef" id="4b8adde5-5057-48cf-8736-124ff75a8c68-ia02" /> in such a way that if this check is skipped, the candidate signature is rejected by the subsequent test performed on a fourth vector of polynomials h.

Anmelder

Firma

THALES DIS FRANCE SAS

Land

🇫🇷 Frankreich

Fachgebiete