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Wireless sensor network (Wireless Sensor Networks, WSN) are widely used in military, national security, anti-terrorism disaster, environmental monitoring, traffic management, health care, manufacturing and other fields. With the the WSN-depth research and application security problem has aroused great concern. Due to the computational speed of the sensor nodes, power energy, communication, power and storage space is very limited, and the general configuration of the harsh environment, no one region or enemy positions, which presented many challenges to the the WSN security program design and safety management. This paper analyzes the characteristics and needs of the WSN security grouped Research and analysis of its shortcomings, on the basis of the WSN security model gives a dynamic based intelligent active defense technology, and the establishment of a system based on the risk assessment The different applications of sensor network security design and management of the risk assessment. Main content: new challenges caused by the conditions of WSN security vulnerabilities, security features, WSN facing attacks, threats of WSN; currently the main idea, the main direction of the WSN security research and research; based on the sensor smart of the basic conditions for research in general, intelligent, proactive, dynamic security protection WSN architecture; establish a flexible security system in the overall security architecture, security assessment and protection of the different applications of WSN design; using NS2 simulation, the performance of the the WSN security model of the application of the the active intelligent dynamic defense testing and inspection. In this paper, on the basis of the theory of knowledge, made the following research: summarize the main idea and the main direction of the WSN security research security and network routing protocol security and safety of the protocol stack, different categories of security means offensive and defensive countermeasures classification elaborate security research; proposed integrated security strategy and technology systems to the the sensor safety of intelligent modules envisaged through the establishment of an intelligent, active dynamic defensive security model and provide overall security solutions for WSN WSN security management for different applications to provide a comprehensive, universal security policy. View of the different needs of different applications of WSN security, the use of risk assessment methods to calculate the security needs of different applications of sensor networks quantitative level, and the establishment of evaluation system based on the level of demand for guiding the WSN security program design, security analysis, security program assessment and security management to provide a reference. In this paper, the following conclusions can be drawn: WSN Unlike traditional network, under the combined effects of the complex security environment, a variety of security needs and their own conditions and other factors, its security is facing some challenging questions. Dynamic defense model based on intelligent active on the techniques and strategies for security issues and countermeasures for unity problem, this paper proposes a WSN security overall solutions for different applications, based on risk assessment security policy evaluation system, a proposed from the WSN individual security needs of different security solutions strategy, the NS2 of which suffered an attack scenario simulation, the combination of this model and assessment system, and can be applied to the design of the WSN security program , protective performance assessment.
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