Trustful Routing Algorithm Research In Wireless Sensor Networks Based On Subjective Logic

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 affairs,environment detecting, health affairs,home network and other commercial fields.Along with WSN's security becoming hot spots in most application environments,the secure protocols and trustful routing algorithms adapting to WSN's environment become the 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 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 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.Furthermore,it emulates the two routing protocols before and after improving on the simulation platform NS2,and the experiment has testified validity and feasibility of the trustful routing algorithm.The main innovation points of the thesis are as follows. 1) Study the typical secure routing protocols in WSN.The thesis analyses the trusting conditions and working principles and experiment results of various of security mechanisms,points out the feasibilities and defects of every kind of security tactics to pave the way for the research of secure trustful routing protocols.2) Study the attack types in WSN.The thesis studies the attack principles, attack characteristics and attack results of various of attack types,target-oriented analyzes which attack types appear in which routing protocols,and has a definite object in view when improving routing algorithms.3) Study the subjective logic model.The thesis innovatively applies the subjective logic model to rationally,effectively,quantitatively appraise the trust degree of sensor nodes,and reflects the different roles of various trustful nodes in the network transmission according to the different calculation regulations and evaluation rules.The thesis combines the subjective logic model and Directed Diffusion routing algorithm,establishes a network model,revises the routing form item,improves the routing algorithm,proposes the Trustful Directed Diffusion routing algorithm based on Subjective Logic,and provides several revelatory ideas for studying the secure trustful routing algorithms.