Grid Services Selection Model Based on Automated Trust Negotiation
Bo Yang · Journal of Chinese Computer Systems · 2007
One of the most promising advantages of grid service technology is the possibility of creating added-value services by combining existing ones.A key step for composing and executing services lies in the selection of the individual services.A layered grid service selection model,ATN-CTT(automated trust negotiation-composition trust template),and algorithm based on ATN(automated trust negotiation) is presented.The top layer is corresponding to service composition trust template(SCTT),and the bottom layer is the selective services of each node in the SCTT.Each service can be visited by it's least disclosure tree(LDT)under the ATN access control strategy.The candidate services form a trust matrix in accordance with their trust value and the SCTT is structured from the each row max of the matrix.At the process of the service composition,the SCTT can ensure the selected service with max trust value.With the ATN access control strategy the services can be accessed and used.Experiments show the validity of the model and it can keep the service composition path more stabilization and stabilization.Combining trust mechanism with ATN can solve access control problems to stranger subjects and service selection in grid dynamic environment.