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Attacking Masked Cryptographic Implementations: Information-Theoretic Bounds
- Publication Year :
- 2021
-
Abstract
- Measuring the information leakage is critical for evaluating the practical security of cryptographic devices against side-channel analysis. Information-theoretic measures can be used (along with Fano's inequality) to derive upper bounds on the success rate of any possible attack in terms of the number of side-channel measurements. Equivalently, this gives lower bounds on the number of queries for a given success probability of attack. In this paper, we consider cryptographic implementations protected by (first-order) masking schemes, and derive several information-theoretic bounds on the efficiency of any (second-order) attack. The obtained bounds are generic in that they do not depend on a specific attack but only on the leakage and masking models, through the mutual information between side-channel measurements and the secret key. Numerical evaluations confirm that our bounds reflect the practical performance of optimal maximum likelihood attacks.<br />Comment: The revised version will appear in ISIT 2022
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2105.07436
- Document Type :
- Working Paper