Ad-hoc multi-dimensional trust evaluation model based on classification of service

Trust models studied before evaluated trust degree by the previous interactions of entities in ad hoc networks within a protocol. However, this way is not accurate and difficult to decide the trust value. The basic difficulty lies in the fact that trust information is often fuzzy and incomplete in an open network environment. The performance of mobile ad hoc network also is constrained by residual energy, delay, delay jitter and other factors. Thus a novel trust model with multiple decision factors is proposed, in which multiple decision factors, involving security trust and quality trust, are incorporated to evaluate trust. AHP (Analytic Hierarchy Process) methodology is used to combine these different factors in our paper. The requirements of the quality and security of nodes differ as services are different, so we also take the classification of service into consideration. Theoretical as well as simulation results show that our scheme is more accurate than the model evaluated just by the previous interactions of entities.