Abstract
Currently, cloud computing has widely been implemented in several organizations. This is due to the fact that this new model delivers cost-efficient, flexibility and scalability computing resources to the clients. This has led to a growing demand of cloud implementations in different sectors. Although cloud computing facilitates data management, it still faces various security problems. So, it is important to examine cloud security issues before moving to this model. In particular, we focus on existing access control mechanisms in cloud computing. Actually, there exist multiple schemes that ensure data protection, such as DAC (Discretionary Access Control), MAC (Mandatory Access Control), RBAC (Role Base Access Control), ORBAC (Organizational Role Based Access Control) and ABAC (Attributes Based Access Control). The main contribution of this paper is to select the appropriate access control model that meets cloud constraints. Based on these considerations, ABAC model is more suitable to cloud environments compared to other models. In this regard, we provide a comprehensive taxonomy of different ABAC schemes.
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