Padding-only Defenses Add Delay in Tor

Padding-only Defenses Add Delay in Tor
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仅填充防御会增加 Tor 的延迟

DOI:
10.1145/3559613.3563207
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发表时间:
2022
期刊:
WPES'22: Proceedings of the 21st Workshop on Privacy in the Electronic Society
影响因子:
--
通讯作者:
Hopper, Nicholas
Hopper, Nicholas
中科院分区:
--
文献类型:
--
作者:
Witwer, Ethan;Holland, James K.;Hopper, Nicholas

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网站指纹识别是一种利用加密下载的大小和时间特征来识别目标网站的攻击。由于这可能会破坏诸如Tor这样的匿名网络的隐私目标,因此文献中已经提出了许多在Tor中防御这种攻击的算法。这些算法通常由注入虚拟“填充”包和实际包的延迟的某种组合组成,以破坏计时模式。出于易用性的原因,ToR旨在提供低延迟;因此,许多作者将重点放在仅填充防御上,认为它们是“零延迟”。我们通过Shadow模拟证明,通过增加队列长度,仅填充防御在全网部署时会增加延迟,因此它们不应被视为“零延迟”。我们进一步认为,未来的防御也应该使用全网部署模拟来评估。
Website fingerprinting is an attack that uses size and timing characteristics of encrypted downloads to identify targeted websites. Since this can defeat the privacy goals of anonymity networks such as Tor, many algorithms to defend against this attack in Tor have been proposed in the literature. These algorithms typically consist of some combination of the injection of dummy "padding'' packets with the delay of actual packets to disrupt timing patterns. For usability reasons, Tor is intended to provide low latency; as such, many authors focus on padding-only defenses in the belief that they are "zero-delay.'' We demonstrate through Shadow simulations that by increasing queue lengths, padding-only defenses add delay when deployed network-wide, so they should not be considered "zero-delay.'' We further argue that future defenses should also be evaluated using network-wide deployment simulations.
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