World Academic Industry Research Collaboration Organization (WAIRCO)
Cloud computing has been envisioned as the next generation architecture of IT enterprise. 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 centers, 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.