Research And Simulation On The Security Transport Protocol For Space DTN Network

Space DTN network is a new type of self-organizing network,in which nodes are made by satellites,spacecraft,space station and the aircraft,aircraft,the airship and so on.Because of its long time-delay,unreliable data rate and intermittent connection,DTN network can't take advantage of the traditional routing transport mechanism.At the same time,the DTN network's data transmission mode is storing-carrying-forwarding.Storing data in the middle node cost long time and is vulnerable to malicious nodes.Based on the above points,designing effective and reliable safety transport protocol becomes the key issue in the current study on space DTN network.In considering of saving reputation,congestion control,contact with figure and network coding,this thesis comes up with security transport protocol for space DTN network.According to the orbit cyclicity and expectancy of satellite nodes and spacecraft,space DTN network can be divided into regular contact and opportunity contact.Regular contact mainly happens between spacecrafts which have a regular orbit.Introducing the concept of contact figure and select the next hop based on it,and it makes use of the power saving prestige and congestion state information to determine the security performance of the intermediate node.Opportunity contact happens between aircraft and satellites which have the irregular orbit.It divides the data packet into groups and codes,and transports the data from different groups with multipath.At the same time,encrypte coding coefficient from source node,and carry on node reputation assessment and link metrics in order to reduce the attacked probability of intermediate nodes and improve decoding rate of the destination node.Simulate the security transport protocol in NS2 network simulation software,and analysis capability from scalability,effectiveness and security.Compared with traditional routing protocols on the packet delivery ratio,network overhead and time delay.The results show that the security transport protocol applies to data transmission in space DTN network.