Modeling Delegation in Requirements-Driven Trust Framework

Exponentially growing of global dynamic interoperation in service workflow requires promising mechanisms and processes to establish trust relationship among entities involved. The information and service sharing on each domain has different set of policies and requirements. In order to provide in place mechanisms to allow previously unknown entities to cooperate or participate in a workflow, the holistic Requirement-Based Trust Framework that facilitates interacting domains through access control policy mapping between interoperating domains has been proposed. However, trust negotiation and establishment processes including policies and roles integration are very costly and sophisticated, especially when more than two domains are involved in the interoperation. In this paper, we propose the model to depict the trust propagation for service distribution and service delegation based on Hierarchical Elementary Net System (HENS) called HENS+ applied to the Requirements-Driven Trust Framework in which the cost incurred during interoperation in many cases is reduced compared to the original framework.