Secure cloud storage management method based on Time Stamp Authority

We present a fundamentally different approach to improve the security of cloud storage. In contrast to previous methods, our approach introduces third party trusted timestamp and certificate into Cloud storage framework. And user's request is multiply validated. There are three main aspects. (i) Certificate identifies the user's identity; (ii) Trusted timestamp is added to the user's operation request; (iii) Cloud storage system communicates with TSA and Directory server for user information verification. Furthermore, our approach has two important features. First, we use PKI technology to improve cloud storage system security, and through Directory server to authenticate the user certificate status. Second, Cloud storage vets user's operation requests based on trusted timestamps and stores user's operation records, which can provide security services including safety audit, electronic evidence and other services. Our results show that our mechanism can vet and monitor various types of data operations in cloud storage system under the premise of increasing a very small overhead, and the security of cloud storage has greatly enhanced.