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Thwarting Wi-Fi Side-Channel Analysis through Traffic Demultiplexing

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

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Thwarting Wi-Fi Side-Channel Analysis through Traffic Demultiplexing

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  1. 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

  2. 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

  3. 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

  4. Our solution: Traffic Demultiplexing • Data transmission

  5. Our solution: Traffic Demultiplexing • A simple example Traffic on each interface PDF on each interface

  6. Design and implementation Network stack with three virtual interfaces

  7. Packets flow on receiver and sender sides

  8. Demultiplexing Scheduler:Masquerading Demultiplexing

  9. 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

  10. Thanks!

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