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Due to the necessity of Critical Infrastructure (CI) Protection against different threats, several security policies must be applied among the organizations of CI. Based on our conducted study about the different constraints and requirements of the collaborative systems within CI, we reached a security solution: Tr-OrBAC. Its principle is to evaluate the trustworthiness of collaborating organizations based on relevant trust criteria aimed at enhancing collaboration decision-making. The takendoi:10.1155/2018/7938727 fatcat:e2myxklcqnefxcrpdobufgmqwm