A P2p Environment Based On The Members Of The Group Trust Model

The fast development of P2P system was due to the popularization of network, pursue the active participation to network for people, and the drive by so many companies and institutions. The system brought potential safety hazards to network while it remedied some deficiencies of C/S system. Traditional central trust mechanism was unfit to the demand of P2P system, so as to establish distributed trust mechanism to enhance the dependability of P2P system.Trust model was the most important component in trust mechanism; it dedicated to the trusted member or trusted data, and ensured members of using resource of network more rationally through restricting the improper actions. The trust model can not only encourage proper actions, but also promote P2P system to well development.The existing trust model was so complicated that limited members' behaviors strictly. A more simple local trust model, group-based trust model, was brought forward. The node can get corresponding historical track records from familiar member group, correct these records on account of the difference between the nodes' evaluative capability, then calculate the trust degree of trade object, and make decision about trade by the result at last. Simulation about the model was developed to investigate its' performance. The size of member group and the familiar degree for network that affect the model's performance were analyzed. The model can improve usability of network, and have the merits of simple structure and strong reliability.