The LSV seminar takes place on Tuesday at 11:00 AM. The usual location is the conference room at Pavillon des Jardins (venue). If you wish to be informed by e-mail about upcoming seminars, please contact Stéphane Le Roux and Matthias Fuegger.
The seminar is open to public and does not require any form of registration.
Since the introduction of the notion of privacy homomorphism by Rivest et al. in the late 1970s, the design of efficient and secure encryption schemes allowing the performance of general computations in the encrypted domain has been one of the holy grails of the cryptographic community. Despite numerous partial answers, the problem of designing such a powerful primitive has remained open until the theoretical breakthrough of the Fully Homomorphic Encryption scheme published by Gentry in the late 2000s. Since then, progress has been fast-paced, and it can now be reasonably said that practical homomorphic encryption-based computing will become a reality in the near future. Nevertheless, a lot of effort remains necessary to drive Fully Homomorphic Encryption schemes beyond theoretical interest, to ensure confidentiality of outsourced data in practical use cases. In this talk, we will first start with a brief history and state-of-the-art, and discuss different challenges that have to be handled: complexity, expansion, security,... Then, we will mention several approaches and results concerning their implementation, complexity and expansion reduction, and security analysis. We will in particular focus on the design of a dedicated stream cipher that helps to manage the expansion issue.