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首页> 外文会议>IEEE International Conference on Acoustics, Speech and Signal Processing;ICASSP >Invisible flow watermarks for channels with dependent substitution and deletion errors
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Invisible flow watermarks for channels with dependent substitution and deletion errors

机译：具有相关替换和删除错误的通道的不可见流水印

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摘要

Flow watermarking 1 is an efficient technique for linking packet flows that helps thwart various attacks in networks such as over the Internet. Current state-of-the-art water-marking schemes withstand packet losses at the expense of compromising invisibility. We present an invisible flow watermarking scheme that can endure large numbers of packet losses. To maintain invisibility, our scheme embeds quantization-index modulation watermarks into inter-packet delays (as opposed to intervals). As the watermark is injected within individual packets, packet losses may lead to water-mark desynchronization and substitution errors. To deal with this issue we propose a maximum likelihood decoding (ML) scheme based on a hidden-Markov model (HMM) of the channel. Experimental results demonstrate that our scheme is robust to both network jitters and packet deletions while remaining invisible to an attacker.
机译：流水印1是一种链接数据包流的有效技术，可帮助阻止诸如Internet之类的网络中的各种攻击。当前最先进的水印方案可承受数据包丢失，但以牺牲隐身性为代价。我们提出了一种不可见的流水印方案，该方案可以承受大量的分组丢失。为了保持不可见性，我们的方案将量化索引调制水印嵌入到数据包间的延迟中（而不是间隔）。随着水印被注入到各个分组中，分组丢失可能导致水印失步和替换错误。为了解决这个问题，我们提出了一种基于信道的隐马尔可夫模型（HMM）的最大似然解码（ML）方案。实验结果表明，我们的方案对于网络抖动和数据包删除均具有较强的鲁棒性，同时对攻击者仍然不可见。

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