Trustworthiness Calculation Based on Delegation Relationship in E-service

In e-service environments, the delegation relationship is rarely considered as one of important factors of trust models. Most of work on delegation relationship focused on the permission of delegatee, delegation depth, delegation constrain and so on. They ignored the potential hazards brought from blind delegation, so easily to form the collusion attack. This paper defines the concept of delegation trustworthiness firstly, and then proposes a method for calculating trustworthiness based on the delegation relationship. The method enables the involved delegator and delegatee to be responsible for their actual behavior in delegation process. The delegate targets can choose a reliable trust entity according to the value of trustworthiness. Finally, a P2P simulation platform is used for experiments, and the simulation results presented verify the validity of the trustworthiness calculation.