skip to main content
Department of Computer Science University of Colorado Boulder
cu: home | engineering | mycuinfo | about | cu a-z | search cu | contact cu cs: about | calendar | directory | catalog | schedules | mobile | contact cs
home · events · thesis defenses · 2009-2010 · 

Thesis Defense - McCoy

ECOT 831

Quantifying and Improving Wireless Privacy
Computer Science PhD Candidate

Wireless devices have become ubiquitous in the daily lives of most people, and thus magnify their potential to harm users' privacy. The main goal of this dissertation is to identify and quantify privacy vulnerabilities in common mobile wireless devices and present practical methods to mitigate them. In this dissertation a holistic approach to achieve the goal of improving wireless privacy is taken, not focusing on a single layer, but focusing on the two key substrate layers, the link-layer and the physical-layer, and their interactions. In order to make this problem more concrete this investigation focus on 802.11, which is the dominant short range wireless protocol. However, the solutions are general enough to be applied to most wireless networks.

To understand the nature and different types of privacy threats, a detailed measurement of link-layer and physical-layer behavior of wireless devices is conducted. Using these measurements, it is demonstrated that wireless device drivers can be fingerprinted quickly and accurately using link-layer information, and that messages can be correlated back to their transmitting device using physical-layer information, even if there are no identifiers present at the link-layer. In response to these threats, first the design and build a prototype implementation of a wireless protocol that encrypts all bits transmitted at the link-layer is presented. Second, this work presents techniques to mitigating physical layer-privacy threats and quantify their effectiveness. Finally, it presents and evaluates methods to facilitate the establishment of trust in wireless protocols without requiring an out-of-band exchange of information. The key contribution of this dissertation is to present a framework of practical and generalized solutions that improve wireless privacy as a whole, and that can be applied to current and future wireless protocols.

Committee: Douglas Sicker, Associate Professor (Chair)
Timothy Brown, Department of Electrical and Computer Engineering
John Black, Associate Professor
Dirk Grunwald, Professor
Richard Han, Associate Professor
Tadayoshi Kohno, University of Washington

See also:
Department of Computer Science
College of Engineering and Applied Science
University of Colorado Boulder
Boulder, CO 80309-0430 USA
Send email to

Engineering Center Office Tower
ECOT 717
FAX +1-303-492-2844
XHTML 1.0/CSS2 ©2012 Regents of the University of Colorado
Privacy · Legal · Trademarks
May 5, 2012 (13:40)