response 2

Abstract

      Data integrity protection in outsourced data is challenging task in cloud computing. Client or third party auditor need to check the integrity of outsourced data. For this purpose so many approaches are introduced with different types of algorithms such as Proof of Retrievablity, provable data possession, privacy preserving, etc. This extensive paper aims to make comparative analysis on RSA based homomorphic and BLS based homomorphic by time factor and produce the best algorithm for data protection as well as time consuming. Which is used to the cloud user choose the best mechanism based on their resource and requirements and help to make  their integrity checking process effectively.

      By its very nature, cloud computing involves some ceding of control from the customer to the service provider. But control and security are not identical. In fact, data security in cloud computing is potentially superior to security in the typical corporate data center due to the same forces that drive so much good through the marketplace as a whole: economies of scale and division of labor. Because security costs are spread among a large number of customers in cloud data centers, cloud operators are able to apply far more resources to physical, technical, and operational security measures than can most  corporations or government agencies. Many large providers also safeguard data security in cloud computing by operating multiple data centers with data  replicated across facilities.

     And unlike most corporations and public agencies, cloud providers' core business is operating and delivering IT services. Managed cloud providers thus bringing a level of experience and expertise to their data security operations that most organizations are hard-pressed to match. But while security technologies and expertise in the cloud data center may surpass that in many corporate data centers, there remain valid concerns about security in what could be called the "fourth tier" of cloud architecture: the public internet, through which cloud services are delivered to end users.

                   Conclusion

    Cloud Computing is a relatively new concept that presents a good number of benefits for its users; however, it also raises some security problems which may slow down its use. Understanding what vulnerabilities exist in Cloud Computing will help organizations to make the shift towards the Cloud.  Since Cloud Computing leverages many technologies, it also inherits their security issues. Traditional web applications, data hosting, and virtualization have been looked over, but some of the solutions offered are immature or inexistent. We have presented security issues for cloud models