Research On Trust Management Model In Mobile Network

MANETs,i.e.mobile Ad hoc network,refers to a communication network consisting of a group of mobile nodes with wireless communication function,which is composed spontaneously and does not need fixed infrastructure.It has the characteristics of open transmission medium,no central node,flexible topological structure,free movement of nodes,complete spontaneous behavior and high degree of autonomy,route discovery and data transmission through cooperative forwarding between nodes.Because of the spontaneity of node behavior in MANETs networks and the limitation of mobile nodes of their own energy and network load,selfish nodes are prone to appear in MANETs networks.Nodes do not actively forward packets unrelated to themselves in order to achieve maximize benefits of their own,these nodes are not aggressive,but only reduce the packet forwarding rate in the network.In addition,the network is also vulnerable to attacks by malicious nodes,such as eavesdropping,false information,collusion attacks,denial of service and other network attacks,which have negative impact on communication security.In view of the above problems,after studying the characteristics of the trust management model in mobile networks and combining the characteristics of MANETs,this thesis proposes a trust management model that classifies nodes,which divides the nodes in the whole network into monitoring nodes and management nodes.The main innovations of this thesis are as follows.(1)Classify nodes.A new way of information collection is adopted,which greatly reduces the overall cost of the network and avoids the overflow of trust information in the network.Due to the existence of management node,the reliability of trust information is improved and the problem of no central node in the network is solved.(2)Consistent hashing algorithm is adopted to solve the load balancing problem of management nodes and the problem of huge data migration caused by network expansion.It can dynamically adapt to the change of network size.(3)By using multicast protocol to implement the trust management model in this thesis,combined with the characteristics of the trust management model in this thesis,the use of multicast routing protocol can effectively improve the transmission efficiency of trust information.The simulation results show that the model can effectively identify and resist multiple attacks,and motivate the selfish nodes to cooperate actively,reducing the network overhead,which proves the effectiveness of the model.