Research On A Trust Model Based On the Qos and Malicious Node Deletion

In cloud environment the nodes provide services with QoS guarantee, so how to choose a credible service is a critical problem. In this paper it is proposed that a kind of mechanism how to construct basic probability assignment based on the Qos constraints that the services provide, and in the process of building the basic probability assignment a partial relation is inducted in order to remove the worthless history information and considering the uncertain information. And based on the discounting operator and the consensus cooperator, the reputation options from different grid nodes can be integrated. In order to prevent being cheating by the malicious nodes, the method of triangular fuzzy number is used to sort the different nodes. Then the deferring operator is inducted to compute the reputation opinion. Simulation tests prove that the model can tackle the trust problem in a simple and efficient way.