In the cloud environment, cloud storage is considered to be an essential service in the present day. Since users can store personal data online and can be able to retrieve the data or remotely store and manage via the internet. Authentication and authorization must be provided perfectly as illegal users may reveal the Information of data stored and the symmetric key information used by the users. Long-standing data or keys are sensitive to brute force attacks and any other attacks. So Cloud Server has to take care of these issues.