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One of the most significant difficulties with developing Service-Oriented Architecture (SOA) involves meeting its security challenges. Access control is an important security mechanism for organizations to protect their resources in collaborative environments and processes. In these processes, shared resources are often used and there are complex relationships between activities and users, so the definition and administration of different security levels (tasks, users, resources, etc.) isdoi:10.5120/5694-7469 fatcat:zqgwxr2jffgvpkryq23s6k5uwm