Preuve de localisation : calculs multi-parties sécurisés

Abstract

In the present day, most people are continuously carrying a smartphone. These devices allow users to localize themselves (GPS) and to stay connected to each other. Thanks to these new technologies, new applications can be designed to allow users to obtain proofs of their own location, authenticated by nearby users. Therefore, a prover can claim not being in a crime scene at a precise time to a judge, and that several witnesses have authenticated his claim. Nevertheless, this approach raises some issues about users’ privacy and anonymity. Indeed, the prover may not want to broadcast his position and identity each time he needs new location proofs. Similarly, witnesses want to keep their identity and location private as well. Despite that, the judge must be able to get the private data back in order to detect and prevent a prover from forging proofs with the complicity of some witnesses. The main purpose of this thesis is to design secure multi-party protocols to generate location proofs, with respect to witnesses and prover’s privacy, and to give the judge the ability to retrieve private data.

Date	26 Aug 2015
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Jean-Marc Robert (Supervisor) & Christophe Bidan (Co-supervisor)