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arXiv 1808.07285cs.CRcs.LG
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DeepCorr:使用深度学习对Tor进行强流相关攻击

DeepCorr: Strong Flow Correlation Attacks on Tor Using Deep Learning

University of Massachusetts Amherst(马萨诸塞大学阿默斯特分校)

Milad Nasr, Alireza Bahramali, Amir Houmansadr

摘要:

流关联是Tor上大量去匿名化攻击中使用的核心技术。尽管流相关攻击对Tor很重要,但现有的流相关技术在大规模应用时被认为在链接Tor流方面是无效和不可靠的,即,但是它们强加了高的假阳性出错率,或者需要不切实际的长流量观测以能够进行可靠的相关。在本文中,我们表明,不幸的是,通过利用新兴的学习机制,可以对Tor流量进行流相关攻击,其准确率比以前高得多。我们特别设计了一个名为DeepCorr的系统,它在关联Tor连接方面的性能远远优于最先进的系统。DeepCorr利用先进的深度学习架构来学习为Tor的复杂网络量身定制的流相关函数,这与以前的作品使用通用统计相关度量来关联Tor流形成对比。我们表明,通过适度的学习,DeepCorr可以将Tor连接(从而打破其匿名性)与比现有算法更高的准确性相关联,并使用更短的流量观察长度。例如,通过收集每个目标Tor流的大约900个数据包(大约900KB的Tor数据),DeepCorr提供了96%的流相关准确度,而RAPTOR最先进的系统使用相同的精确设置只能提供4%的准确度。我们希望我们的工作能够证明,鉴于学习算法的最新进展,流相关攻击对Tor的威胁正在升级,这需要Tor社区及时部署有效的对策。

英文摘要:

Flow correlation is the core technique used in a multitude of deanonymization attacks on Tor. Despite the importance of flow correlation attacks on Tor, existing flow correlation techniques are considered to be ineffective and unreliable in linking Tor flows when applied at a large scale, i.e., they impose high rates of false positive error rates or require impractically long flow observations to be able to make reliable correlations. In this paper, we show that, unfortunately, flow correlation attacks can be conducted on Tor traffic with drastically higher accuracies than before by leveraging emerging learning mechanisms. We particularly design a system, called DeepCorr, that outperforms the state-of-the-art by significant margins in correlating Tor connections. DeepCorr leverages an advanced deep learning architecture to learn a flow correlation function tailored to Tor's complex network this is in contrast to previous works' use of generic statistical correlation metrics to correlated Tor flows. We show that with moderate learning, DeepCorr can correlate Tor connections (and therefore break its anonymity) with accuracies significantly higher than existing algorithms, and using substantially shorter lengths of flow observations. For instance, by collecting only about 900 packets of each target Tor flow (roughly 900KB of Tor data), DeepCorr provides a flow correlation accuracy of 96% compared to 4% by the state-of-the-art system of RAPTOR using the same exact setting. We hope that our work demonstrates the escalating threat of flow correlation attacks on Tor given recent advances in learning algorithms, calling for the timely deployment of effective countermeasures by the Tor community.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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