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In last decades, the notion of collaborative systems is presented as the new concept in Critical Infrastructures. It regroups different organizations collaborating in order to ensure the continuity of these infrastructures. However, some malicious behavior can arise causing perturbations on the information systems of the organizations. To avoid this behavior, building trust between collaborating organizations is necessary; it allows cooperating and sharing resources in a secure way. In this paper, we present Tr-OrBAC: a new trust model applicable in collaborative systems; it is based on the OrBAC (Organization Based Access Control) access control model and trust evaluation. In this paper, we will focus on explaining and detailing the proposed trust model.

the success of collaborative systems has become necessary due to the important role of these systems as they ensure the continuity of Critical Infrastructures. Among the aspects, enabling the success of collaborative systems is their security against all threats. In this paper, we focus on a new model allowing security and protection of collaborative systems within critical infrastructures. Tr-OrBAC is a combination between the access control and the trust evaluation. The principle is to add a new trust parameter in the security rules generated by OrBAC model. Our goal in this paper is to evaluate the interaction messages between the different actors involved in the collaboration. We will present the existing models, and then we will discuss the steps used to implement our model, using different tools (UML, Eclipse).