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SkypeMorph : Protocol Obfuscation for Tor Bridges. Hooman Mohajeri Moghaddam  Baiyu Li  Mohammad Derakhshani .  Ian Goldberg Presented by Ganbi. Outline. Overview Problem Solution Questions. Anonymity. Is it Important? People’s lives depend on it

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skypemorph protocol obfuscation for tor bridges

SkypeMorph: Protocol Obfuscation for Tor Bridges

HoomanMohajeriMoghaddamBaiyuLi Mohammad Derakhshani. Ian Goldberg

Presented by Ganbi

outline
Outline
  • Overview
  • Problem
  • Solution
  • Questions
anonymity
Anonymity
  • Is it Important?
    • People’s lives depend on it
    • Authoritative Government vs. Activist Groups
    • Syria, Egypt, China
  • Answer: Tor
tor problem
Tor Problem
  • The public list of Tor relay nodes can give away all the IP addresses.
  • To fix, developers added “bridge”
4 ways to get bridge ip
4 Ways to get Bridge IP
  • https://Bridges.torproject.org will tell you few based on your IP address and location
  • Mail [email protected]
  • Via social network
  • You can set up your own and tell your target users directly
problem
Problem
  • Slowly China was able to block most Bridges by probing
  • DPI (deep packet inspection) is still possible
solution paper
Solution/Paper
  • Pluggable transports
  • SkypeMorph
    • Disguise the Tor packets to look like Skype traffic by using already existing Skype VoIP protocol and user authentication system.
solution
Solution

Bridge

advantages
Advantages
  • Anyone can use, it’s free!
  • Can transfer reasonable size of data = no bottleneck
  • Encryption already built in
  • In order to stop Tor, they also have to stop legitimate Skype calls, which is highly unlikely
  • Another big advantage: Harder to block bridges even after they are found
works cited
Works Cited
  • Moghaddam, Li, Derakhshani, and Goldberg "SkypeMorph: Protocol Obfuscation for Tor Bridges" (n.d.): n. pag. Print.
  • https://www.torproject.org/about/overview.html.en
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