For the problem of data security in the cloud storage system

a self-healing Byzantine Quorum system for the cloud storage security is proposed. In this system

the virtual machines are used as back-end storage devices to construct the virtual storage node. The diverse operating systems

dynamic migration and rapid generation mechanism of virtual machines are introduced to build dynamic and heterogeneous storage system architecture. On the basis of the Byzantine fault tolerance threshold

the concept of self-healing threshold is presented and several security protocols are devised to achieve automated anomaly detection and storage node recovery. The experimental results show that the proposed cloud storage system is greatly robust and can effectively improve the security of stored data.