King Saud University
In past three decades, the computing world is based on the Internet, featured by the rapid development and application of computer technology. The cloud computing model is one of the very important shapes of a new era. This technology based on the distributed computing, parallel computing, grid computing, Virtualization technologies, property-based remote attestation technologies, etc. The cloud computing market and development are growing rapidly and bringing up numerous challenges and big security issues of the today's world. Some issues concern on the cloud computing is the security and confidentiality of user data in terms of its location, relocation, availability and security.