On the Effectiveness of Traffic Analysis Against Anonymity Networks Using Flow Records

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Provided by: Columbia University
Topic: Security
Format: PDF
The authors investigate the feasibility of mounting a de-anonymization attack against Tor and similar low-latency anonymous communication systems by using NetFlow records. Previous research has shown that adversaries with the ability to eavesdrop in real time at a few internet exchange points can effectively monitor a significant part of the network paths from Tor nodes to destination servers. However, the capacity of current networks makes packet-level monitoring at such a scale quite challenging. They hypothesize that adversaries could use less accurate but readily available monitoring facilities, such as Cisco's NetFlow, to mount large-scale traffic analysis attacks.
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