Next-Generation Optimization Models and Algorithms in Cloud and Fog Computing Virtualization Security: The Present State and Future

Virtualization is becoming popular and is gaining widespread attention in recent years. However, with its popularity comes the challenge of securing the virtualized environment. Security measures for virtualized systems cannot always be applied in the same manner as in physical systems. Virtualized environments may have multiple virtual systems on the same physical machine, so different levels of security one needed. The hypervisor is the controlling program that provides the virtual systems' effective isolation and security. In this article, we present a comprehensive review of the existing security ideas and architectures for virtualized environment and some of the open issues in virtualization security.