Trust-Based Risk Assessment In Peer-to-Peer Network

With the rapid development of network, there are more and more distributed applications based on peer-to-peer structure. Peer-to-peer network takes advantages of effective payload balancing and immense information and resources. But p2p network which is lack of central controlling and constraints on behaviors of peers in the network gets several obvious security problems. To solve these problems, this paper proposes a trust-based risk assessment method in P2P networks.The purpose of trust-based risk assessment method is to quantitate the threatening factors in interactions of peers in P2P network as risk value. Trusted risk is the base of research on trust-based risk calculation. This paper proposes trust-based risk calculation, according to historical records of interactions and trust value. Risk calculation based on trust integrates trust and risk into trusted risk based on traditional risk functions, combining trust mechanism and traditional risk functions. The simulations on trust and risk calculation proved feasibility and the effectivity of calculations.Trust-based risk assessment model proposes a flow of risk assessment upon risks of peers' information interaction in P2P network. The first step is to get the quantity of risk,and then implement the mapping from risk values to risk levels . To solve non-central controlling of P2P network, risk sentences and risk assessment reports' structure and formation is standardized. The model proposes strategy of sorting and controlling of risks.The trust-based risk assessment model is carry out in P2P file sharing system. Introduces components of the model , main designing and work flow. Moreover , analyzing performance of the system.