一种隐形的非盲流水印技术

摘要

已有流水印技术向目标数据流中引入的时延较大,隐蔽性较差,攻击者可检测和移除其中所嵌入的水印信息,甚至提取出其中的水印信息并将其复制到其他未标记数据流中,进而误导追踪.提出一种隐形的非盲流水印技术,借鉴扩频通信原理,使用伪噪声码对水印位进行扩展,通过调制包间隔到达时延将扩展水印嵌入目标数据流中.实验结果表明,该技术可有效抵御时间分析攻击,且对时间扰乱具有鲁棒性.%As flow watermarking technologies introduce significant delays to target network flows, attackers can easily detect and remove the inserted watermarks, even recover these watermarks and duplicate them to unwatermarked network flows. This paper proposed an invisible and non-blind flow watermarking technoogy, which embedded watermarks spread by pseudo-noise code in the randomly chosen inter-packet delay positions by manipulating the packet arrival times. Empirical results demon-strate that this technology is robust against timing analysis attack and timing perturbation.