ABSTRACT
Cloud computing service providers have differences regardless of the nature or scale, particularly in the security avoidance and risk management. In the cloud computing model, users pay much attention to the security of services in the process of operation. Most users’ subconscious believes that cloud service providers have an obligation to improve the supervision and introduce advanced technology to ensure the security of the service. Cloud environments in the cloud computing model can break geographical constraints, so the data is stored is not limited to specific location, anywhere is possible to become a data storage center, the risk of data because of this increasing its security is facing serious challenges. If not improve from the
a node, if the lack of perfect security system, it will naturally affect the data cloud computing security. Data security of cloud computing system usually involves the following problems: data transmission, long-term survival and recovery.
