Abstract
Cloud Computing is an attractive paradigm that changed the ways institutions and companies are managing their computing needs. It emerges as a new solution which ensures several benefits. However, like any other emerging technology, the issues and limitations are also many. Security has been one of the main barriers to the adoption of the Cloud paradigm, especially by organizations dealing with customers sensitive information. Access Control Policies (ACPs) have become an important issue in the security field of cloud computing. The cloud service providers are responsible for enforcing access control and they normally rely upon conventional access control mechanisms which are considered as a deprecated means. This paper presents the most known access control models and proposes an overview of the semantic access control approaches which use Semantic Web technologies in order to improve the security in a Cloud environment.
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