arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.04291cs.CR
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一种针对网站指纹攻击的实时的防御方法

A Real-time Defense against Website Fingerprinting Attacks

Shawn Shan, Arjun Nitin Bhagoji, Haitao Zheng, Ben Y. Zhao

摘要:

像Tor这样的匿名系统容易受到网站指纹(WF)攻击,其中本地被动窃听者推断受害者的活动。目前基于深度学习分类器的WF攻击已经成功地克服了许多提出的防御。虽然最近利用对抗性示例的防御提供了希望,但这些对抗性示例只能在网络会话结束后计算,因此在实际设置中为用户提供的保护很少。我们提出了Dolos,一个实时的修改用户网络流量以成功规避WF攻击的系统。Dolos通过计算输入不可知的对抗补丁将虚拟数据包注入流量跟踪,这些补丁会破坏WF攻击中使用的深度学习分类器。然后应用补丁来实时的改变和保护用户流量。重要的是,这些补丁是由用户侧秘密参数化的,确保攻击者无法使用对抗训练来击败Dolos。我们通过实验证明,Dolos在各种设置下都能提供94%以上的保护,抵御最先进的WF攻击。与之前的防御相比,Dolos在更高的保护性能和更低的信息泄漏和带宽开销方面表现出色。最后,我们证明了Dolos对各种自适应对策的鲁棒性,以检测或破坏防御。

英文摘要:

Anonymity systems like Tor are vulnerable to Website Fingerprinting (WF) attacks, where a local passive eavesdropper infers the victim's activity. Current WF attacks based on deep learning classifiers have successfully overcome numerous proposed defenses. While recent defenses leveraging adversarial examples offer promise, these adversarial examples can only be computed after the network session has concluded, thus offer users little protection in practical settings. We propose Dolos, a system that modifies user network traffic in real time to successfully evade WF attacks. Dolos injects dummy packets into traffic traces by computing input-agnostic adversarial patches that disrupt deep learning classifiers used in WF attacks. Patches are then applied to alter and protect user traffic in real time. Importantly, these patches are parameterized by a user-side secret, ensuring that attackers cannot use adversarial training to defeat Dolos. We experimentally demonstrate that Dolos provides 94+% protection against state-of-the-art WF attacks under a variety of settings. Against prior defenses, Dolos outperforms in terms of higher protection performance and lower information leakage and bandwidth overhead. Finally, we show that Dolos is robust against a variety of adaptive countermeasures to detect or disrupt the defense.

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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