International Journal of Information Technology & Computer Science ( IJITCS )
Cloud computing is an improvement product of combining web technology, grid computing and virtualization. It has become one of the most important issues for the information technology in recent years. A lot of applications have been proposed and discussed on the cloud computing environment because it can bring many benefits like reducing the cost of maintaining data centers in an enterprise, low data management cost and retrieval of data whenever the user want, etc. As more sensitive and personal data is shared and stored in the cloud computing server, a question of trust on cloud computing is wildly been discussed.