[IP] Tracking Anonymous Peer-to-Peer VoIP Calls on the Internet
Begin forwarded message:
From: Kurt Albershardt <kurt@xxxxxx>
Date: August 24, 2006 8:34:51 PM EDT
To: dave@xxxxxxxxxx
Subject: Tracking Anonymous Peer-to-Peer VoIP Calls on the Internet
ABSTRACT
Peer-to-peer VoIP calls are becoming increasingly popular due to
their advantages in cost and convenience. When these calls are
encrypted from end to end and anonymized by low latency anonymizing
network, they are considered by many people to be both secure and
anonymous.
In this paper, we present a watermark technique that could be used
for effectively identifying and correlating encrypted, peer-to-peer
VoIP calls even if they are anonymized by low latency anonymizing
networks. This result is in contrast to many people's perception. The
key idea is to em- bed a unique watermark into the encrypted VoIP
flow by slightly adjusting the timing of selected packets. Our
analysis shows that it only takes several milliseconds time
adjustment to make normal VoIP flows highly unique and the embedded
watermark could be preserved across the low latency anonymizing
network if appropriate redundancy is applied. Our analytical results
are backed up by the real-time experiments performed on leading peer-
to-peer VoIP client and on a commercially deployed anonymizing
network. Our results demonstrate that (1) tracking anonymous peer-to-
peer VoIP calls on the Internet is feasible and (2) low latency
anonymizing networks are susceptible to timing attacks.
<http://ise.gmu.edu/%7exwangc/Publications/CCS05-VoIPTracking.pdf>
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