Abstract-In the extremely dynamic cloud computing system, traditional access control technologies provide no autonomic authorization and access control for the users on their data in remote cloud. Once data is migrated to the cloud, the user transfers the control to the providers of the cloud services and cloud hardware. So, whether the data is proper protected will be the users' most primary concerns and major challenges. This paper proposes a new decentralized information flow control model-DIFC-AC and its implementation. It expands the security label of DIFC with authorization condition used to express the control demands of the user, and access to the data is arbitrated based on their labels by intercepting IPC-relevant system calls. Thereby, the controls on the data are reached to the cloud, and sequentially the users' demands on the confidentiality, integrity and controllability of their data are meet.
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