Presenting: Dafna Shahaf. Infranet: Circumventing Web Censorship and Surveillance Nick Feamster, Magdalena Balazinska, Greg Harfst, Hari Balakrishnan,

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Presentation transcript:

Presenting: Dafna Shahaf

Infranet: Circumventing Web Censorship and Surveillance Nick Feamster, Magdalena Balazinska, Greg Harfst, Hari Balakrishnan, David Karger

+ IP, key

3. Hide( ) Challenge! 2. Hide( BBC.com ) 1. Tunnel

Discussion (1) James Bond movie! – Response of U.S. Army? Human component: software distribution Assumptions – Scope of possible attacks from the censor? – Censor does not want to affect normal users – Downsampling images?

Discussion (2) Detecting responders by analyzing downstream traffic – Errors? See if hash changes? Other schemes – Random numbers in hyperlinks? Overhead seems significant – Requests adequately spaced Human factors – Altruism – Fear of punishment

Improving Wireless Privacy with an Identifier-Free Link Layer Protocol Ben Greenstein, Damon McCoy, Jeffrey Pang, Tadayoshi Kohno, Srinivasan Seshan, David Wetherall

Problem Packets still carry header information – Cleartext – Can be used to identify and track users Solution: Slyfy – Use predetermined aliases – Encapsulating protocol

Discussion Surprise Deployment: – Different encryption mechanism – Cold start Large reduction in throughput – De-emphasized, deal breaker Wireless – Who does the sender trust? Mechanism for distributing symmetric keys reveals too much? – Solved(?)