The Secure Data Sharing Mechanism for Cloud Computing Based Cloud Storage System

Secure cloud storage, which is an emerging cloud service, is designed to protect the confidentiality of outsourced data but also to provide flexible data access for cloud users whose data is out of physical control. The emergence of cloud infrastructure has significantly reduced the costs of hardware and software resources in computing infrastructure. To ensure security, the data is usually encrypted before it’s outsourced to the cloud. Unlike searching and sharing the plain data, it is challenging to search and share the data after encryption. Nevertheless, it is a critical task for6 the cloud service provider as the users expect the cloud to conduct a quick search and return the result without losing8 data confidentiality. To overcome these problems, Finally, the proposed construction21 is demonstrated practical and efficient in the performance and property comparison. However, the use of CP-ABE may yield an inevitable security breach which is known as the misuse of access credential (i.e. decryption rights), due to the intrinsic “all-or-nothing” decryption feature of CP-ABE. In this paper, we investigate the two main cases of access credential misuse: one is on the semi-trusted authority side, and the other is on the side of cloud user. To mitigate the misuse, We also present the security analysis and further demonstrate the utility of our system via experiments