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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Censorship Circumvention: Staying Ahead in a Cat-and-Mouse Game
DTSTART:20130611T140000
DTEND:20130611T150000
DTSTAMP:20260427T223705Z
UID:ca8fe30e57e90e299b9afd560ef84992ad446e148d6ac02f0bc2cabc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Nikita Borisov\, University of Illinois at Urbana-Champa
 ign\nThe Internet enables access to a wide variety of information sources\
 ; many countries and organizations\, however\, try to restrict such access
  for political and social reasons. People whose access has been censored m
 ake use of a variety of circumvention technologies to find the information
  they need\; in turn\, the censors use increasingly sophisticated tools to
  render these technologies ineffective. One of the most powerful technique
 s available to the censors has been the insider attack\, wherein the censo
 r pretends to be a user of a system in order to learn secret information a
 bout its functions. For example\, censors continually update a blacklist o
 f IP addresses belonging to circumvention proxies. I will discuss some new
  techniques designed specifically resist this insider threat.\nrBridge foc
 uses on the distribution of proxy addresses to users. It tracks the reputa
 tion score of each user\, representing the likelihood of this user reveali
 ng a proxy address to the censors\, and uses an introduction mechanism to 
 resist Sybil attacks. A particular challenge of rBridge is to preserve the
  privacy of its users by keeping the knowledge about which users know whic
 h proxies secret.\nCirripede is an alternate approach that seeks to elimin
 ate the insider threat entirely. It uses redirection proxies that are acti
 vated by a special cryptographic signal\, which can be generated using onl
 y public information but can only be recognized by the proxies. Instead of
  hiding the location of the proxies\, Cirripede places them in highly conn
 ected ISPs\, such that blocking Cirripede would result in high collateral 
 damage.
LOCATION:BC 420 https://plan.epfl.ch/?room==BC%20420
STATUS:CONFIRMED
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