Accession Number:

ADA602282

Title:

Users Get Routed: Traffic Correlation on Tor by Realistic Adversaries

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2013-11-01

Pagination or Media Count:

14.0

Abstract:

We present the first analysis of the popular Tor anonymity network that indicates the security of typical users against reasonably realistic adversaries in the Tor network or in the underlying Internet. Our results show that Tor users are far more susceptible to compromise than indicated by prior work. Specific contributions of the paper include 1 a model of various typical kinds of users, 2 an adversary model that includes Tor network relays, autonomous systems ASes, Internet exchange points IXPs, and groups of IXPs drawn from empirical study, 3 metrics that indicate how secure users are over a period of time, 4 the most accurate topological model to date of ASes and IXPs as they relate to Tor usage and network configuration 5 a novel realistic Tor path simulator TorPS, and 6 analyses of security making use of all the above. To show that our approach is useful to explore alternatives and not just Tor as currently deployed, we also analyze a published alternative path selection algorithm, Congestion-Aware Tor. We create an empirical model of Tor congestion, identify novel attack vectors, and show that it too is more vulnerable than previously indicated.

Subject Categories:

  • Computer Systems Management and Standards

Distribution Statement:

APPROVED FOR PUBLIC RELEASE