基于差值扩展的无线传感器网络无损认证水印算法*

在军事、远程医疗、卫星遥感等领域无线传感器网络数据认证过程中，往往存在对原始数据流的需求。利用差值扩展思想，提出一种适用于无线传感器网络的无损水印方案。水印信息依赖于数据流本身而产生，将经扩频处理后再嵌入到无线传感器网络数据流中，水印检测成功率较高。当含水印WSN数据未遭受攻击时，可无损恢复原始数据流。实验结果表明了该WSN无损水印算法的有效性，算法显示出比同类算法更高的透明性，同时具有较强的窜改识别能力。

Lossless authentication watermarking algorithm based on difference expansion in wireless sensor network

To meet the demand of the original data in wireless sensor network (WSN) data authenticity in some sensitive data application scenarios, such as military, remote medicinal, and satellite remote sensing, this paper proposed a reversible watermarking scheme in WSN by using the difference expansion. It generated the watermark from the original data steams itself. To improve the watermark detection reliability, the scheme embeded the spread watermark into the WSN data streams. The original data stream could be losslessly recovered from the unaltered watermarked WSN data streams. Extensive experimental results demonstrate the effectiveness of the proposed scheme. It can achieve better transparency than some existing similar schemes. Meantime, it has good identification ability to illegal tampering.