Abstract: Traditional digital watermarking cannot be applied directly in Wireless Sensor Network (WSN) that has special features, such as collecting data in distributed sub-clusters and processing data in-network. According to the hierarchical clustering architecture of WSN, a distributed consultative mechanism was established in clusters to generate the proper watermarking; thus, a distributed watermark algorithm was proposed. Sensor nodes of each group were embedded with watermarks with low computational complexity. The watermarks have shown the superiority of resistance to the attacks and the robustness of the lossy data compression. The results of analysis and experiments show that the watermarking proposed is easy to be checked. It can successfully identify whether data had been illegally tampered and thus effectively protect the security of WSN.

Key words: Wireless Sensor Network (WSN), security, group negotiation, digital watermark, data reliability

摘要： 无线传感器网络通常具有分布式数据采集与网内数据处理的特点，因此基于传统数字水印的安全技术难以直接用于传感器网络；针对传感器网络聚类分层的体系结构，通过在簇内建立分组协商机制来生成待嵌入水印，在此基础上实现了一种新的分布式数字水印算法。传感器节点以分组的形式嵌入水印，计算复杂度低，水印具有良好的抗攻击性和对有损压缩的鲁棒性。实验结果表明用该算法嵌入的水印可检测性强，能够成功地鉴别数据是否被非法篡改，保护传感器网络数据安全。

关键词: 无线传感器网络, 安全, 分组协商, 数字水印, 数据可靠性