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Virtualization technology is the basis of cloud computing. Multiple virtual machines on a single physical host are isolated from each other. However, covert channel breaks the isolation and leaks sensitive information covertly. In this paper, we construct one type of classic covert timing channel, the on/off channel, on the Xen hyper visor using shared memory. And then we evaluate its bit rate and...
Access control mechanisms can't efficiently restrict hidden information flow, and confidential information can stealthily leak out with hidden information flow. We outline a state-based approach to analyzing hidden information flow. The main idea of the approach is to model secure systems as finite automata, and analyze the properties of information flow by studying the characteristic of the finite...
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