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SkypeMorph: Protocol Obfuscation for Tor Bridges Hooman Mohajeri Moghaddam  Baiyu Li  Mohammad Derakhshani.  Ian Goldberg Presented by Ganbi.

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Presentation on theme: "SkypeMorph: Protocol Obfuscation for Tor Bridges Hooman Mohajeri Moghaddam  Baiyu Li  Mohammad Derakhshani.  Ian Goldberg Presented by Ganbi."— Presentation transcript:

1 SkypeMorph: Protocol Obfuscation for Tor Bridges Hooman Mohajeri Moghaddam  Baiyu Li  Mohammad Derakhshani.  Ian Goldberg Presented by Ganbi

2 Outline 1. Overview 2. Problem 3. Solution 4. Questions

3 Anonymity Is it Important? People’s lives depend on it Authoritative Government vs. Activist Groups Syria, Egypt, China Answer: Tor

4 Tor Overview

5

6

7 Tor Problem The public list of Tor relay nodes can give away all the IP addresses. To fix, developers added “bridge”

8 Tor Problem

9 Bridge

10 4 Ways to get Bridge IP https://Bridges.torproject.org will tell you few based on your IP address and location Mail Via social network You can set up your own and tell your target users directly

11 Problem Slowly China was able to block most Bridges by probing DPI (deep packet inspection) is still possible

12 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.

13 Solution Bridge

14 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

15 Two Methods

16

17 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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