Due to overlapping coverage areas of nodes, traditional data encryption methods for sensor networks fail to consider the logical correlation between common nodes and transmission paths, resulting in low data capture efficiency, low data communication after encryption, and poor data sensitivity extraction effect. Therefore, this paper proposes an automatic encryption method for sensor network capture data based on symmetric algorithm. Based on the analysis of WSN architecture and sensor node structure, symmetric algorithm encryption flow is designed; The network attack model is established, and the multi-path transmission security is analyzed according to the symmetric algorithm, the probability of successful eavesdropping is calculated, and the sensor network capture data is encrypted accordingly. In order to verify the performance of network capture data encryption, a comparative experiment is designed. The results show that the data recall rate is as high as 99.0%, the data communication volume can reach 6.97 × 104byte, and the extraction accuracy of sensitive information can reach 97.9%. This method can effectively solve the problems existing in traditional methods and lay a foundation for the development of sensor network data encryption.

由于节点的覆盖区域重叠，传统的传感器网络数据加密方法未能考虑到公共节点与传输路径之间的逻辑相关性，导致数据捕获效率低，加密后的数据通信低，数据敏感性提取效果差。因此，本文提出了一种基于对称算法的传感器网络捕获数据自动加密方法。在分析无线传感器网络体系结构和传感器节点结构的基础上，设计了对称算法的加密流程。建立了网络攻击模型，并根据对称算法分析了多径传输的安全性，计算了成功窃听的概率，并对传感器网络捕获的数据进行了加密。为了验证网络捕获数据加密的性能，设计了一个对比实验。结果表明，数据召回率高达99.0％，数据通信量可达到6.97×104byte，敏感信息的提取精度可达到97.9％。该方法可以有效解决传统方法存在的问题，为传感器网络数据加密的发展奠定基础。