The secure cloud storage using decentralized access control with unspecified authentication for secures the data. The cloud verifies the authenticity of the series without knowing the user's identity before storing data. The authors' scheme also has the added feature of access control in which only valid users are able to decrypt the stored information. The scheme prevents replay attacks and supports creation, modification and reading and writing data stored in the cloud. Their authentication and access control scheme is decentralized and robust, unlike other access control schemes designed for clouds which are centralized.