The Secure Localization Algorithm Of SDV-HOP In Wireless Sensor Networks

The application of wireless sensor network in social practice is wider and wider with the deep development of scientific and technological and social needs in the actual developing. Position information of sensor nodes is crucial, so the scientists have been dedicated to sensor network positioning technology research and have achieved great results in terms of positioning accuracy. But, with the numerous uses of wireless sensor networks, its security problems are becoming more and more serious. And obtain the location information securely and accurately is also the premise and foundation of realizing function modules such as building and maintaining the network, locating the monitoring event, tracking the target. So research on security positioning system in wireless sensor networks is a very challenging issue with broad application prospects.Wireless sensor network node positioning technology has been studied firstly. And then the standards of performance evaluating have been analyzed in detail. Next, security risks and secure localization mechanism in wireless sensor networks have been studied in two aspects of distance based or not. Also a detailed analysis of network positioning impact caused by wormhole attack, replay, forgery, tampering attacks, which attacks, changing distance attacks And the corresponding defense means have also been studied. In order to achieve the system's security position, typical safety positioning mechanisms have also been studied, such as:Beacon Suite secure localization algorithm, SPINE, ROPE, Bilateration safe location algorithm, LAD secure localization algorithm. The DV-HOP location algorithm which is not based on distance has been studied deeply. Algorithm process, error sources, positioning accuracy, security risks and outside interference of the traditional DV-HOP algorithm have also been analyzed in detail. For its shortcomings such as low positioning accuracy, vulnerable to wormhole attack and block attacks, a new location algorithm for wireless sensor network security SDV-HOP is proposed. Firstly, a password-based symmetric encryption and authentication solutions are added in the distance vector exchange protocol to defend against masquerade attacks. In the key agreement phase, nodes and neighbor nodes generate a key set of common for communication through their respective key. Beacon node authentication is in communication process of encryption and transmission. Because initial key is distributed randomly, even if an attacker hijack a part of the node, it still cannot infer the key the rest of keys between nodes; Second, for attacks against the wormhole attack and blocking the safe handling, an average hop-based distance estimation algorithm is introduced. The appropriate distance value for each hop is selected by judging and comparing hop distance. And an effective jump distance is obtained by using the weighted average method.So it can avoid errors caused by wormhole attacks. Simulation experiments on Matlab simulation platform show that the security algorithm not only has high accuracy but also can effectively prevent and resist external attack, so the new algorithm has high security.