Research On The Detection And Defence Method Of Malicious Attack Nodes In Opportunity Network

Opportunity network is a kind of mobile self-organized networke formed by nodes moving which brings opportunities to meet,through certain routing policy to guarantee the message forwarding successfully.However there are malicious nodes in the network,they continuously injected into the network lots of false messages to take up other nodes cache space,resulting in network congestion or even collapse.Therefore,how to detect the malicious nodes and refuse to receive the messages they sent become the key to the normal operation of the opportunity network.Firstly,analyses the opportunity to network routing strategy,the types of malicious attacks and harm,elaborated the related routing policy against malicious attacks,the simulation experiment platform are introduced.On the basis of this,this paper mainly analyzes the injection attack of malicious nodes in the network of opportunities.Secondly,through the opportunity to network behavior characteristics of the malicious nodes to sum up,based on private blacklist and network nodes blacklist malicious evidence collection and storage mechanism,the nodes in private list and blacklist is used to store network's injection attacks of malicious nodes,node for the message of the source node in the blacklist was refused to accept,in order to resist malicious node injection attack.Thirdly,this paper puts forward node private blacklist to detect malicious nodes and update mechanism and network blacklist to detect malicious nodes and update mechanism,make the blacklist mechanism conforms to the changes of the opportunity to network in a timely manner to make dynamic adjustment,improve the blacklist,the adaptability and practicability of the network.Finally,We made the detection and defence method of malicious attack nodes in opportunity network combined with the existing routing strategy Prophet,form RA-Prophet which have malicious nodes attack defending ability.Through the simulation experiment validated RA-Prophet performance in message transmission success rate,message transmission delay and the detection rate of malicious nodes in opportunity network.