The Research On Key Management Protocols For EBS Based Hierarchical Sensor Networks

Wireless sensor network is a new-style network technology which springs up in recent decade, expands rapidly and receives universal recognition since its appearance. Different with the traditional network, it integrates wireless communication, transducer, MEM technologies and so on, and has a wide utility in numerous domains such as military, environmental monitoring, intelligent house and so on.This paper summarized the architecture, performance standards, characteristic and application of wireless sensor network, take its security as the main line, analyzed the demand, threat and countermeasure of the safety. From the point of key management, the paper probes into the problems of dynamic key management in hierarchical sensor network, which received widely research in recent years. The main content of this paper is the key management in EBS based hierarchical sensor network and the optimization scheme of collusion.Hierarchical sensor network has low consumption of energy, high reliability of data transmission and high extendibility of network. Many protocols of its key management choose EBS theory based on combines knowledge. This paper considered the characteristics of hierarchical sensor network architecture and dynamic key management, designed the key management model of hierarchical sensor network, summarized EBS theory and its application in key management, and designed the key management model of EBS based wireless sensor network. The performance of the model has also been evaluated from energy consumption, key connectivity and key storage.Collusion problem is a weakness in key management of EBS based wireless sensor network, and it can threaten the security of the entire key space. How to optimized key management protocol effectively to prevent collusion problem is a realistic question. From the point of graph theory, this paper proposed two kinds of collusion optimization scheme by using the principle of geographic distribution information and minimum spanning tree separately. The result of simulation experiment indicated:the optimization scheme proposed can enhance the security and anti-capture of network effectively, which compared with the former protocols.