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Guillaume Scerri (LMF/ENS Paris-Saclay)
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The intricacies of formally proving e-voting mixnets
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Mixnets are an essential building block for e-voting. Informally they break the link between the ballot cast by a voter and the ballot decrypted in order to compute the tally. While the functionality of these mixnets is relatively simple, the cryptographic tools used in order to achieve the desired properties are fairly complex, both in terms of proof techniques (notably rewinding or reprogramming random oracles), and in terms of primitives (at least zero knowledge proofs and commitments). Furthermore finding the right, composable security definitions is rarely done in the literature, and also bears careful consideration. In this talk we will explore the intricacies of formally proving these constructions. We will both discuss the complexity of a potential proof in the computational model, and how our recent extension of the computationally complete symbolic attacker model allows for a (reasonably) simple proof.
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Séminaire en présentiel ouvert à tous et toutes mais avec inscription obligatoire au moins 48h à l'avance pour *tous* les participants en présentiel auprès de Nadia Derouault <nadia [*] derouaultinria [*] fr>.
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