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The rapid growth of using cloud-based services in recent years is an undeniable fact as it has increased the efficiency in accessing shared pools of configurable computing resources. However, there are serious concerns about the reliability of this emerging technology and it is anticipated that cloud computing security concerns will be the most important and challenging issue in IT industry. Accordingly, a hybrid re-encryption model has been presented in this paper to ensure data security in cloud computing environments based on the concepts of index classification, time-based procedures, and attributes. Accordingly, data are classified to four main rings based on their attributes. Furthermore, a hybrid ring was established to provide a secure connection between rings by dual encryption process. This is regarding the characteristics of source and destination rings. Protected rings perform the re-encryption process …