Research On Trust In Grid Environment

Grid is a global solution to address the requirements of more and more computing ability. Grid is different from traditional network. Computing resources and users are distributed in a grid is dynamic. A virtual trust relationship must be established and destroyed dynamically. And the trust relationship need to break through the location of geography, the means of share or cooperation, and constrains of using computational resources in each independent security mechanism. Grid computing system will help people to solve many problems that could not be solved previously. It is a new way, looser and more convenient.Grid Security Infrastructure isn't concerned with the dynamic characteristic in grid environment and its extension is limit. Some trust models based on the reputation between two entities are presented. But these models can't resolve the effect on trust value because of malevolence recommendation. And the method to combine and adjust the recommendation trust is not so good and reasonable.In this paper, a new trust model to deal with the trust relationship between grid entities is provided. This model is a two-layer trust model based on behavior, and the upper layer established and maintained recommendation trust relationship between different autonomous domains in grid. Lower layer was in charge of how domain manager evaluated trust of entities in his domain. A practical method was given to process recommendation trust and an algorithm to adjust trust relationships between domains based on entities interactions and the direct trust between two entities. At last, the analysis of the model based on the test show that the method to combine the recommendation trust can evaluate the trust relationships between entities more precisely, thus resolve security problems such as malevolence recommendation existing in grid environment more effectively. It is also effective and extensible.