Automatic verification of cryptographic protocols: privacy-type properties

Cheval, Vincent (2012) Automatic verification of cryptographic protocols: privacy-type properties. Doctor of Philosophy (PhD) thesis, ENS-Cachan.

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Abstract

Many tools have been developed to automatically verify security properties on cryptographic protocols. But until recently, most tools focused on trace properties (or reachability properties) such as authentication and secrecy. However, many security properties cannot be expressed as trace properties, but can be written as equivalence properties. Privacy, unlinkability, and strong secrecy are typical examples of equivalence properties. Intuitively, two protocols P, Q are equivalent if an adversary can not distinguish P from Q by interacting with these processes. In the literature, several notions of equivalence were studied, e.g. trace equivalence or a stronger one, observational equivalence. However, it is often very difficult to prove by hand any of these equivalences, hence the need for efficient and automatic tools. We first worked on a approach that rely on constraint solving techniques and that is well suited for bounded number of sessions. We provided a new algorithm for deciding the trace equivalence between processes that may contain negative tests and non-determinism. We applied our results on concrete examples such as anonymity of the Private Authentication protocol and the E-passport protocol. We also investigated composition results. More precisely, we focused on parallel composition under shared secrets. We showed that under certain conditions on the protocols, the privacy type properties is preserved under parallel composition under shared secrets. We applied our result on the e-passport protocol. At last this work presents an extension of the automatic protocol verifier ProVerif in order to prove more observational equivalences. This extension have been implemented in ProVerif and allow us to automatically prove anonymity in the private authentication protocol

Item Type: Thesis (Doctor of Philosophy (PhD))
Uncontrolled keywords: Cryptographic protocols, Formal verification, Symbolic model, Automatic, Equivalence properties, Composition, Constraint systems, Horn clauses
Subjects: Q Science > QA Mathematics (inc Computing science) > QA 75 Electronic computers. Computer science
Q Science > QA Mathematics (inc Computing science) > QA 9 Formal systems, logics
Divisions: Faculties > Sciences > School of Computing > Security Group
Depositing User: Vincent Cheval
Date Deposited: 23 Jan 2015 12:17 UTC
Last Modified: 29 May 2019 14:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46883 (The current URI for this page, for reference purposes)
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