QIN Zhong-yuan^1,3, CHEN Qi², LV You², QIANG Yong², GUO Ai-wen², SHEN Ri-sheng^1,3, Zhang Qunfang⁴, ^1,2Southeast University, China, ³Ministry of Public Security, China and ⁴Nanjing Institute of Artillery Corps, China

Virtualization technology becomes a hot IT technology with the popu-larity of Cloud Computing. However, new security issues arise with it. Specifically, the resources sharing and data communication in virtual machines are most concerned. In this paper an access control model is proposed which combines the Chinese Wall and BLP model. BLP multi-level security model is introduced with corresponding improvement based on PCW (Prioritized Chinese Wall) security model. This model can be used to safely control the resources and event behaviors in virtual machines. Experimental results show its effectiveness and safety.