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Communication Dans Un Congrès Année : 2023

A generic information-theoretic framework for evaluating the side-channel security of masked implementations

Résumé

We propose an information-theoretic framework that aims at unifying and optimizing several previous works on the side-channel security of masked im- plementations of any order d in some Abelian group: Duc at al.at EURO- CRYPT2015, Dziembowski et al.at TCC2016, Ch ́erisey et al.at CHES2019, Prest et al.at CRYPTO2019, Masure et al.at CARDIS2022, Ito et al.at CCS2022, Liu et al.at ITW2023, and B ́eguinot et al.at COSADE2023 and ISIT2023. In this general framework, two theoretical ingredients are system- atically leveraged: (i) a variation of a Fano inequality relating the attack performance (success rate) to a measure of information between the sensi- tive variable and the leakage; (ii) a variation of a Mrs. Gerber Lemma lower bounding a statistical measure of the sensitive variable by the product of sim- ilar measures for its d + 1 masking shares. Depending on the choice of the information measure and of the statistical measure, and possibly on Pinsker- type inequalities relating these measures, one can establish anew all previously published lower bounds on the number of queries necessary to achieve a given attack success rate. These results make progress on the evaluation of the secu- rity guarantees of higher order masking, and stimulate further research on best possible bounds & possible application to other types of masking schemes.
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Dates et versions

hal-04136986 , version 1 (22-06-2023)

Identifiants

  • HAL Id : hal-04136986 , version 1

Citer

Olivier Rioul, Julien Béguinot, Yi Liu, Wei Cheng, Sylvain Guilley. A generic information-theoretic framework for evaluating the side-channel security of masked implementations. 19th International Workshop on Cryptographic Architectures Embedded in Logic Devices (CryptArchi 2023), Jun 2023, Cantabria, Spain. ⟨hal-04136986⟩
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