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Explore the research project combating side-channel information leaks in Wi-Fi networks. Discover threats, defenses, and a novel solution through Traffic Demultiplexing.
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Thwarting Wi-Fi Side-Channel Analysis through Traffic Demultiplexing Yangyi Chen Supervisor: Prof. XiaoFeng Wang On-going research project in collaboration with UNL, Microsoft Research and McGill University
Side-channel information leaks • Threats in different communication scenarios • Web browsing • http://www.youtube.com/user/mountmic#p/u/3/3sGH9KpYOJk • Video-streaming • Voice over-IP • Particularly serious in wireless networks (shared-medium nature) • Mostly caused by analyzing statistical characteristics of encrypted traffic • Distributions of packet sizes • Inter-packet timings
Current defense techniques • Change the distribution of packet sizes • Padding packets • Faking superfluous packets • Chopping packets into fixed size segments • Traffic morphing • Limitations of those techniques • Significant communication overheads • Hard to deploy
Our solution: Traffic Demultiplexing • Data transmission
Our solution: Traffic Demultiplexing • A simple example Traffic on each interface PDF on each interface
Design and implementation Network stack with three virtual interfaces
Real-world Deployment and Demo setup • Three laptops • First with our AP-side prototype driver installed, equipped with a Proxim AP-2000 11b/g Cardbus series. • Second with our Client-side prototype driver installed, equipped with D-link WNA-2330. Third with wireless card set to monitor mode and use Wireshark to collect traffic. • http://www.youtube.com/user/fccherry091?feature=mhum