Survey on Securely Shared Data on Cloud

Cloud is common place to store data and shared with multiple users. But some system problem or human error it genrate more problem about integrity of cloud data. In the proposed scheme a new privacy preserving authenticated scheme for accessing secure data. It helps to verifies the authenticity of the user without knowing the users identity before storing information. It also allowed only valid users are able to decrypt the stored information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. Moreover, authentication and access control scheme is decentralized and robust, unlike other access control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable to centralized approaches