Study On Distributed Coorperative Situation Awareness For Wireless Network Based On Trust

The rapid development of wireless network makes it get more complex,heterogeneous and uncertain,ubiquitous wireless entities provide people with extremely rich applications but they are also easy to be attacked and captured.Entities always compete excessively to seek the optimization of their own security functions.The availability and security of the network is facing severe challenges.Traditional centralized perception system does not match the heterogeneous and complexity of the wireless network.In this case,the distributed cooperative situation awareness is widely concerned as a new network management and operation method.For the existence of a large number of deception,tamper with their own data and other acts of disrupting the operation of the network,we introduce trust into distributed collaborative situation awareness.Integrating the situation elements into trust,using trust as the coordination mechanism to deal with the non-authenticity of information interaction between entities and assist network in security management and operation.Specific work is as follows:Firstly,to solve the lack of evaluation of entity behavior in distributed wireless networks,a situation awareness mechanism based on integrated trust is proposed.Take multiagent system as the research platform,this method introduces the time attenuation function and the standard deviation parameter to process the situation elements of the trust,and uses the distributed cooperation way to perceive the trust of each agent in the network.Using the revised calculation model to check if the agents have false and deceptive behavior and establishing a punishment mechanism.At the same time,calculate agent's comprehensive situation indicator from several dimensions,take trust as the main basis when agents choose the interact targets.Using trust as the main reference elements of the network security situation awareness program.The simulation results show that the proposed mechanism can effectively identify and evaluate the malicious behavior of the agent.When the collusion attack occurs,the deviation of trust is smaller,and the comprehensive situation indicator can realize load balancing and effectively curb the activity of malicious agents.Secondly,in order to improve the accuracy of spectrum situation awareness in distributed networks.Focusing on the spectrum sensing data falsification attack during consistent spectral situation fusion process,a spectrum situation awareness scheme basedon dynamic trust is proposed.The algorithm obtains the instantaneous trust of the node by evaluating the difference of the interacting data between secondary users and referring to the the ebbinghaus forgetting curve.Through the consistency detection,each node obtains the long-term trust of all the adjacent users.Combine the instantaneous trust and the long-term trust,we get the dynamic integrated trust as the main reference of the reliability of the interaction data between the users to curb the influence of the malicious users when spectrum sensing.The theoretical analysis and simulation results show that the proposed scheme is superior to the traditional cooperative spectrum sensing algorithm in convergence and stability.The accuracy of spectrum detection is improved,and has stronger resistance to collusion attack lunched by malicious agents.