The Research Of Trust Relationship Model With Stakeholder-Centric In Service Virtual Organization

The service grid is the combination of the grid and the service-oriented architecture. It aims at providing an overall sharing of service resources for the users in grids. However, the security requirements of the service-oriented grid are higher and more extensive because of its characteristics, such as large scale, dynamics, heterogeneity, and the resource's autonomy. And the trust problem is the key of the grid's security. The trust relationship model is a required component of the service grid's basic infrastructure.A new trust model, named the trust relationship model with the stakeholder-centric, is proposed in this paper based on some existing trust models. The trust model is designed for the service virtual organization. It combines the stakeholder management in the virtual organization and the trust management based on domains. Also the trust model is based on entities'behavior. Both rewards and punishments mechanisms are introduced to the new trust relationship model. The trust relationship is classified to the direct trust relationship and reputation-based trust relationship, so that the complete trust information is provided for the trustable interoperation between entities in service grids. In the service virtual organization for a certain task, the stakeholder manages the trust relationship, while trust domains in service grids are trust management units in the grid, not related to some certain task. In the trust relationship evolution, the mechanism of trust recession with time is introduced and the trust relationship is considered to be closely related to the context. Malicious nodes'behavior is kept down with trust punishment mechanism. What's more, the risk evaluation method is designed, so that the service virtual organization has double trust insurance. Finally, random selection for the trustable services is utilized in the trust relationship model to weaken the of the phenomenon of hot spots on services.In the end, simulation experiments are designed and finished to validate the accuracy and efficiency of the trust relationship model with the stakeholder-centric. And an experiment is made to evaluate the effectiveness of the random selection method for the of the phenomenon of hot spots on services.The analysis of experiment results shows that the trust problem of service grid can be resolved effectively with the trust relationship model with stakeholder-centric. Compared to other trust models, the malicious discovery ratio and the success ratio of tasks are improved to some degree, and the phenomenon of hot spots on services is successfully weakened.