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Evaluation de la confiance dans les architectures de sécurité

Abstract : In a increasingly connected world, trust in information systems is essential. Thus, many questions about their security arise. Topics of these questions include individual data confidentiality as well as protection of Industrial Critical Systems(ICS). For instance, ICS are deployed in sectors including energy or transportation where security is of high importance. In this thesis, we address three problems related to the security architecture of information systems. We first propose an architecture for a protocol splitting device. This provides protection against networkattacks by isolating and filtering data exchanges. We show that this new security equipment is well suited for ICS. Then, we focus on end-user security. We define a user-centric Public Key Infrastructure (PKI) called LocalPKI. By using self-signed certificates, this infrastructure combines the user-friendliness of PGP-based PKI and the security of hierarchical PKI. Finally, we improve the trust anchormechanism. It is employed by Certification Authorities (CA) and especially used in PKIX or LocalPKI. In that respect, we first define multi-party protocols to securely compute dot and matrix products. Then, we explain how to apply them on trust aggregations and thus on the reputation of certification authorities.
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Submitted on : Thursday, January 17, 2019 - 4:38:14 PM
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  • HAL Id : tel-01985183, version 1

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Jean-Baptiste Orfila. Evaluation de la confiance dans les architectures de sécurité. Cryptographie et sécurité [cs.CR]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAM034⟩. ⟨tel-01985183⟩

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