International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Cloud computing provides the way to share distributed resources and services that belong to different organizations or sites. Since Cloud computing share distributed resources via network in the open environment thus it makes security problems. In contrast to traditional solutions, where the IT services are under proper physical, logical and personnel controls, Cloud Computing moves the application software and databases to the large data centres, where the management of the data and services may not be fully trustworthy. This unique attribute, however, poses many new security challenges which have not been well understood. In this paper, the authors focus on cloud data storage security, which has always been an important aspect of quality of service.