arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.08481cs.CRcs.NI
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通过隐私保护测量了解Tor的使用

Understanding Tor Usage with Privacy-Preserving Measurement

Akshaya Mani, T Wilson-Brown, Rob Jansen, Aaron Johnson, Micah Sherr

摘要:

Tor匿名网络很难测量,因为如果不小心,测量可能会危及网络用户的隐私(以及潜在的安全)。最近的工作提出了使用差分隐私和安全聚合技术来安全地测量Tor,并开发了初步的概念验证原型工具,以证明这些技术的实用性。在这项工作中,我们显着增强了两个这样的工具-PrivCount和Private Set-Union Cardinality-以支持对以前从未测量过的新型Tor使用行为的安全探索。使用增强的工具,我们对Tor进行了详细的测量研究,涵盖了Tor使用的三个主要方面:有多少用户连接到Tor,他们从哪里连接,用户最常与哪些目的地通信,以及存在多少洋葱服务以及如何使用它们。我们的发现包括Tor每天有大约800万用户(比之前认为的多四倍),而Tor用户IP在4天内几乎翻了两次。我们还发现,通过Tor访问的网站中,约40%有torproject.org域名,约10%的网站有amazon.com域名,约80%的网站有一个域名,该域名被列入Alexa前100万网站列表。最后,我们发现大约90%的洋葱地址查找是无效的,超过90%的尝试连接到洋葱服务失败。

英文摘要:

The Tor anonymity network is difficult to measure because, if not done carefully, measurements could risk the privacy (and potentially the safety) of the network's users. Recent work has proposed the use of differential privacy and secure aggregation techniques to safely measure Tor, and preliminary proof-of-concept prototype tools have been developed in order to demonstrate the utility of these techniques. In this work, we significantly enhance two such tools--PrivCount and Private Set-Union Cardinality--in order to support the safe exploration of new types of Tor usage behavior that have never before been measured. Using the enhanced tools, we conduct a detailed measurement study of Tor covering three major aspects of Tor usage: how many users connect to Tor and from where do they connect, with which destinations do users most frequently communicate, and how many onion services exist and how are they used. Our findings include that Tor has ~8 million daily users (a factor of four more than previously believed) while Tor user IPs turn over almost twice in a 4 day period. We also find that ~40% of the sites accessed over Tor have a torproject.org domain name, ~10% of the sites have an amazon.com domain name, and ~80% of the sites have a domain name that is included in the Alexa top 1 million sites list. Finally, we find that ~90% of lookups for onion addresses are invalid, and more than 90% of attempted connections to onion services fail.

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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