Circuit fingerprinting attacks: Passive deanonymization of tor hidden services

Albert Kwon, Mashael AlSabah, David Lazar, Marc Dacier, Srinivas Devadas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

80 Scopus citations

Abstract

This paper sheds light on crucial weaknesses in the design of hidden services that allow us to break the anonymity of hidden service clients and operators passively. In particular, we show that the circuits, paths established through the Tor network, used to communicate with hidden services exhibit a very different behavior compared to a general circuit. We propose two attacks, under two slightly different threat models, that could identify a hidden service client or operator using these weaknesses. We found that we can identify the users’ involvement with hidden services with more than 98% true positive rate and less than 0.1% false positive rate with the first attack, and 99% true positive rate and 0.07% false positive rate with the second. We then revisit the threat model of previous website fingerprinting attacks, and show that previous results are directly applicable, with greater efficiency, in the realm of hidden services. Indeed, we show that we can correctly determine which of the 50 monitored pages the client is visiting with 88% true positive rate and false positive rate as low as 2.9%, and correctly deanonymize 50 monitored hidden service servers with true positive rate of 88% and false positive rate of 7.8% in an open world setting.
Original languageEnglish (US)
Title of host publicationProceedings of the 24th USENIX Security Symposium
PublisherUSENIX Association
Pages287-302
Number of pages16
ISBN (Print)9781931971232
StatePublished - Jan 1 2015
Externally publishedYes

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