From inter-connecting P2P overlays to co-operating P2P systems. (De l'interconnexion à la coopération des systèmes pair-à-pair)

Peer-to-peer (P2P) systems are used by millions of users every day. In many scenarios, it is desirable for the users from di erent P2P systems to communicate and exchange content or services with each other. This requires co-operation between the P2P systems, which is often di cult or impossible, due to the two following reasons. First is the lack of an inter-overlay routing infrastructure throughout these systems, caused by the incompatibilities in overlay networks on top of which they are built. Second, there are incompatibilities in the application protocols of these systems. The main topic of this thesis is enabling the cooperation between P2P systems. The thesis introduces a cooperation framework for backward-compatible cooperating heterogeneous P2P systems which constitutes two parts. The rst one is an inter-overlay routing framework which allows to inter-routing between heterogeneous overlay networks. The second one is the cooperation application, built on the top of the inter-overlay routing framework, which aims at solving the incompatibilities in the application protocols of P2P systems. However, due to the di erences in contexts of di erent application domains, in the cooperation framework, we only introduce the principles underpinning the building of cooperation application. As a case study of the cooperation framework, we introduce a complete solution for cooperating P2P le-sharing networks which is applicable for all current P2P le sharing networks. The solution includes the cooperation application, running a protocol named Inter-network File-sharing Protocol (IFP), operating upon the inter-overlay routing framework. Through the experiments, we show the e ciency of the inter-overlay routing framework as well as the e ciency of the solution for cooperating P2P le-sharing networks. While investigating the inter-overlay routing, we found that the inter-connecting P2P overlays can achieve important features including scalability, localization, resilience and self-organization. We believe that with these features, the inter-connecting P2P overlays are suitable to be communication architectures of many Cyber-Physical Systems (CPS). Therefore, in the second topic of this thesis, we investigate a case study of using interconnecting P2P overlays for smart grid, a typical example of CPS. In the case study, a hierarchically inter-connecting Distributed Hash Table (DHT) serves as the fundamental part of communication infrastructure of Advanced Metering Infrastructure (AMI) in smart grid. The analysis and experiments show the scalability and communication e ciency of the proposed architecture.