Wireless sensor networks are composed of sensor nodes which are limited in computational capabilities,power and memory resources,and they are susceptible to a variety of security threats.Security issues in WSNs have are the research focus in academy and industry.First,the early existing research results in wireless sensor network security was briefly surveyed,and then the security issues in WSNs were classified into five categories： cryptography algorithms and key management,secure routing,secure data aggregation,secure location,and privacy preservation.The mechanisms and characteristics of various techniques of these issues were described,while the focus was put on these new techniques that had been developed in recent three years.Finally on the basis of a comprehensive comparison and analysis of these existing techniques,it is points out that the heterogenous WSNs,inside attack and defensive techniques as well as privacy preservation techniques are the hot topics and future research trends in WSNs.%由于无线传感器网络中的节点在计算能力、电池容量以及存储能力上受到限制,使得WSNs面临较多的安全威胁.针对WSNs的安全问题首先简要回顾WSNs安全问题的早期研究成果;其次,将近年来WSNs的安全问题划分为密码算法与密钥管理、安全路由、安全数据融合、安全定位及隐私保护5个方面,并深入讨论这5个方面的攻、防策略.最后,指出异构WSNs、内部攻击攻、防策略以及隐私保护等3个方面是WSNs安全领域未来的热点研究方向.
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