1. Alex Guy
packets (stars)
tor routers
users
web servers
(squares)

2. Overview of Tor Distributed anonymity network “The Onion Router”
A user connects to a random chain of 3 routers
No router knows both the start and end points
Dave
Bob
Wikipedia.org
Alice
Carol
User
Tor routers
Web server

3. Simulation Overview Loads geographic Tor router locations
Picks random points for users and servers (unfortunately in the ocean)
Generate packets with random paths
Continuously advance each packet to its destination
< MATLAB >
...
>> t %run simulation in t.m

4. Animation
With a global view, can we trace traffic from start to end?