Wireless Sensor Networks(WSN) are kinds of being based on amounts of the micro mobile equipments and used for collecting,spreading and handling information. Recently,with the progress of micro-electro-mechanical systems(MEMS) and the wireless network technology,people can develop the multifunctional sensor nodes with low-power consumption,and construct the wireless sensor network with low cost.WSN has wide application potentials in military cheap men's nike shoes affairs,environment detecting, health affairs,home network and other commercial fields.Along with WSN's security becoming hot spots in most application environments,the Lacoste Polo Shirts secure protocols and trustful routing algorithms adapting to WSN's environment become the chi flat iron key questions restricting the further wide applications of WSN.Firstly this thesis introduces the characteristics and security problems of WSN, and analyzes the typical routing protocols in WSN.The energy chi hair straighteners shortness and weakness of computing and hostility nodes' attack,such characteristics of sensor nodes put out the extreme challenge in designing the secure trustful routing protocols. Owing to this,with the ralph lauren polo shirts combination of the usability of various of attack types and subjective logic model in WSN,the thesis aims at deeply studying the working procedure of the secure trustful routing algorithm based on subjective logic to be more suitable to some WSN's transmission circumstances with high security.Based on the detailed analysis of the typical Directed Diffusion routing protocol,the thesis introduces the subjective logic to evaluate and judge the nodes' value of trust degree,proposes the Trustful Directed Diffusion routing algorithm based on Subjective Logic with the full consideration of the influences of the nodes' value of trust degree on routing algorithms.
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