NDLI: Performing traffic analysis on a wireless identifier-free link layer

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Performing traffic analysis on a wireless identifier-free link layer

Content Provider	ACM Digital Library
Author	McCoy, Damon Greenstein, Ben Sicker, Douglas Bauer, Kevin Grunwald, Dirk
Abstract	Recent work has focused on removing explicit network identifiers (such as MAC addresses) from the wireless link layer to protect users' privacy. However, despite comprehensive proposals to conceal all information encoded in the bits of the headers and payloads of network packets, we find that a straightforward attack on a physical layer property yields information that aids in the profiling of users. In this paper, a statistical technique is developed to associate wireless packets with their respective transmitters solely using the signal strengths of overheard packets. Through experiments conducted in a real indoor office building environment, we demonstrate that packets with no explicit identifiers can be grouped together by their respective transmitters with high accuracy. We next show that this technique is sufficiently accurate to allow an adversary to conduct a variety of complex traffic analysis attacks. As an example, we demonstrate that one type of traffic analysis--a website fingerprinting attack--can be successfully implemented after packets have been associated with their transmitters. Finally, we propose and evaluate techniques that can introduce noise into the measurements of such physical layer phenomena to obfuscate the identifiers derived from them.
Starting Page	18
Ending Page	23
Page Count	6
File Format	PDF
ISBN	9781605582177
DOI	10.1145/1565799.1565804
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-04-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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