Research Of Secure Routing Algorithm Based On Trust Degree For Wireless Sensor Networks

Wireless sensor network is a horizonal frontior field that is intensively focused and highly intersected by multidisciplinary.It can collabrately monitor in real time, sense and collect all kinds of environment or the monitor subjects' information by various assembled mirco sensor,then process the inforamtion by the embedded system,at last send the inforamtion sensed to the user terminal in the way of multi-hop.Thus truely accomplish the idea of ubiquitous computing.How to safely communicate with each other is one of the key issues in WSN.The thesis mainly studies Geographic Information Security routing protocol in WSN netwoks.In view of the energy-aware of WSN,this thesis does some research on routing protocol of Trust Degree.The main work and innovation illustrates the following aspects:1) This thesis researches on the routing protocol,normal attacks approachs and safety measures of WSN,and it focuses on two typical routing protocols: GEAR(Geographic and Energy Aware Routing),GPSR(Greedy Perimeter Stateless Routing),and then analyzes these protocols' characteristics.For different network model and different simulation scenarios,this thesis chooses the packet delivery fraction,average end-to-end delay of data packets and network life time to simulate these protocols in just network environment through using NS2(Network Simulation of two version).The simulation result shows that GEAR routing protocol on performance parameters in the General better.2) For energy-constrained wireless sensor network characteristics,this thesis designs and realizes a new protocol TD_GEAR(Trust Degree of GEAR) which is based on Trust Degree by improving the protocol of GEAR.The protocol of TD GEAR according to the Trust Degree of nodes,choose the best Trust Degree nodes as the routing nodes,it avoids these low Trust Degree nodes,classifies the nodes according to the energy status,and then prolongs the lifetime of the network and enhances network security. 3) Through research on the protocol about energy-aware,this thesis suggests a new Location-based key release random binary polynomial program,and in TD_GEAR utilizes the Key management mechanism to protect the data transmitting.4) We implement the protocol of TD_GEAR and analyze the code of GEAR and then simulate it by using NS2 with in such aspects of trust degree,the packet delivery fraction,average end-to-end delay of data packets,normalized routing load and drop fraction of data packets.The simulation result shows that the security performance of TD GEAR is better than that of GEAR.This thesis is supported by National Natural Science Foundation of China (Projects No:60672137,60773211),Specialized Research Fund for the Doctoral Program Foundation of Ministry of Education of China Under Grant(No. 20060497015) and Supported by Program for New Century Excellent Talents in University(NCET-08-0806).