Distributed decision-making model for mobile P2P networks

The only trust is inadequate when a decision is made to identify the best set of peers to utilize in the mobile P2P networks.To solve the problem,a distributed decision-making model(DDM) for mobile P2P networks based on game theory was proposed.The mechanism using game theory to model risk provides better protection from malicious peers,and defines the behavior of peers in a mobile P2P system by introducing utility function.The utility function takes into consideration the costs and benefits as perceived by each peer by being connected to the mobile P2P system and particular events that occur within the system.The aim to incorporate the element of trust and risk into a single model is to improve the security in mobile P2P networks.The unique feature of the mechanism is that it not only helps a mobile peer to make a decision,but also mitigates its vulnerabilities in the trust-based security mechanism.In addition,it is also a good start for exploring the tradeoffs among risk,trust and utility.Results of experiment show that for risk averse peers and risk neutral ones,the proposed mechanism is qualified to prevent the malicious peer' attacks such as independent cheat and group cheat while maintaining efficiency.