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Cloud computing is a dynamic coordination system composed of multiple services, in such dynamic and uncertain environment, dynamic trust model has become a hot research. The research methods are reviewed on the concept of trust and dynamic trust, and the dynamic trust management model based on ontology. Comment and comparative analysis are conducted on typical PTM and TMV dynamic trust models. Problems...
Network security plays an important part in LAN system. The 802.1X protocol provides a port-based network access control to the LAN. In this paper, three cases of user name attacks against the 802.1X are given firstly. Then, the design flaws of 802.1X system are analyzed. At last, an improved authentication process is presented and how to prevent the user name attacks is discussed.
Directed Diffusion (DD) of Wireless Sensor Networks is a flat routing model, in which the periodical diffusion of exploratory data adopts flooding diffusion. This strategy will inevitably bring about heavy traffic load and affect seriously transmission performance of network. Based on this flaw, an improved ant colony algorithm is presented and applied to DD, called IACA-DD. The foundation of gradients...
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