Asymmetric encryption to secure multi-proprietor data sharing for activemembers in cloud

Cloud Computing provides an efficient way for sharing resources among cloud users with a low maintenance cost. Unfortunately sharing resources in a cloud may not be fully trusted by users, since cloud service providers will have complete control over the services on their computing infrastructure. Sharing data in a multi-proprietor manner with frequent change in their membership will always be a challenging issue for preserving data on one side and identity privacy on another side. The constructed system will impose access control policies of data owners, preventing the data to be shared in a secured manner among the cloud users.