Research On The Trust Model Based On Weighted Closeness

Due to the advantages at the information exchange, resources sharing, collaborative work and parallel processing, the distributed network has rapidly become the direction of network developing. The distributed network is characterized by its openness, dynamic property and autonomy. Compared with the traditional C/S network application mode, the distributed network pays more attention to the collaboration between nodes. In support of distributed network platform, such as pervasive computing, grid computing, P2P computing, Ad Hoc networks, P2P e-commerce, e-government and other large-scale distributed systems are widely used. The wide application of the distributed network greatly improves the application range and vitality. And at the same time, it puts forward new requirements on network management and security management in particular. Distributed network performance has never been able to achieve the theoretically best state. One of the main reasons is the lack of trust between the nodes.Traditional security technology has not been a good solution to the security threats arose from a distributed system. Trust mechanism is an effective way to address these issues. It provides new thinking and methods to ensure the security of distributed environments and has become a current research hotspot. Trust model is the basis of trust mechanism. Due to the complexity of the trust itself, building efficient, high-precision trust model is still a challenging and very significant issue.At present, by using different theories and methods, many scholars has carried out fruitful research on the theory and technology of trust and a lot of trust model has been proposed. By analyzing the existing trust model, we can see that although a lot work has been done on the trust quantification, the research on trust is far from enough. The research on the theoretical and key technology of the trust model is carried out in this thesis. Aiming at the current situation that the research on the trust combination in trust measure is not enough, a trust model based on weighted closeness is proposed, in order to support the distributed network security and trust mechanisms. For the current rationality problem of trust network construction, a trust source network construction method based on trust source is given. The adjacency list is used to store the trust information, this kind of network building and storing method lays the foundation for the trust search. The trust search and selection rules are given to reduce the time complexity. The weighted closeness is used in the combination of the trust paths. Considering the trust paths and the direct trust and recommendation trust among the nodes in the network, the trust value reflects the entity's objective credibility more truly. The Strategy for inhibiting the malicious recommendation is given and the time decay of trust is discussed. The simulation results show validity of the model.