In order to improve safety certification of wireless sensor networks ,a new scheme is proposed based on a shared key mutual authentication and key agreement ,including registration phase ,login phase ,authentication and key agreement stage .The registration phase is to complete registered user node A and the sensor node S ,and store the user node A pseudo -identity ID :PIDA ,the pseudo -identity information PIA ,hash function H(・)and the sensor nodes S identity IS .In the login phase ,the user enters a smart card with the identity ID A and signature S1 to obtain identity information IA .The authentication and key agreement phase is completed using mutual authentication and shared key .Compared with other schemes ,the proposed scheme provides an-onymity to avoid a simulated attack user ,nodes ,and can avoid replay attack ,middle attack ,DoS attacks ,to improve the network security .In terms of computational overhead ,the execution time of the program is about 0 .42 ms ,compared with similar pro-grams to reduce the amount of computation .%为了提高无线传感器网络的安全认证，提出了一种基于共享密钥的互认证和密钥协商方案，包括注册阶段、登录阶段、认证和密钥协商阶段3个部分。注册阶段，完成用户节点 A和传感器节点S的注册，并存储用户节点 A的伪身份ID ：PID A ，伪身份信息PIA ，hash函数 H（・）信息和传感器节点 S的身份 IS 。登录阶段，用户凭借身份IDA 和签名 S1进入智能卡获取身份信息 IA 。认证和密钥协商阶段，完成相互认证和共享密钥的使用。与其他方案相比，所提出的方案提供了匿名服务，避免了用户、节点的模拟攻击，并可以抵抗重放攻击、中间人攻击、DoS攻击，提高了网络的安全性。在计算开销方面，该方案的执行时间约为0．42ms，与同类方案相比较减少了计算量。
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