About
Amin
Amin Tootoonchian
PhD Student
Bahen Centre for Information Technology, Room 5165
Systems and Networking Group
Department of Computer Science
University of Toronto
Mailing Address:
Bahen Centre for Information Technology
40 St. George St., Room BA 4242
Toronto, Ontario, M5S 2E4 Canada
E-mail: amin at cs toronto edu
I am a PhD student in the Systems and Networking Group. My advisor is Prof. Yashar Ganjali. Recently, I got my Master's degree (January 2009, co-advised by Stefan Saroiu, Yashar Ganjali). I got a Bachelor's degree from the Department of Computer Engineering at Sharif University of Technology in July 2007.
Publications
  • Amin Tootoonchian, Monia Ghobadi, Yashar Ganjali
    OpenTM: Traffic Matrix Estimator for OpenFlow Networks
    To appear in the Proceedings of the 11th International Conference on Passive and Active Network Measurement (PAM), Zurich, Switzerland, April 2010.
  • Amin Tootoonchian, Stefan Saroiu, Yashar Ganjali, and Alec Wolman
    Lockr: Better Privacy for Social Networks
    Proceedings of the 5th ACM International Conference on emerging Networking EXperiments and Technologies (CoNEXT), Rome, Italy, December 2009.
  • Amin Tootoonchian, Kiran K. Gollu, Stefan Saroiu, Yashar Ganjali, and Alec Wolman
    Lockr: Social Access Control for Web 2.0
    Proceedings of the First ACM SIGCOMM Workshop on Online Social Networks (WOSN), Seattle, WA, August 2008.
Projects
OpenTM

OpenTM is a traffic matrix estimation system for OpenFlow networks. OpenTM uses built-in features provided in OpenFlow switches to directly and accurately measure the traffic matrix with a very little overhead. In addition, OpenTM uses the routing information learned from the OpenFlow controller to intelligently choose the switches from which to obtain flow statistics, thus reducing the load on the switches. We explore several algorithms for choosing which switches to query, and demonstrate that there is a trade-off between accuracy of measurements, and the worst case maximum load on individual switches, i.e., the perfect load balancing scheme sometimes results in the worst estimate, and the best estimation can lead to worst case load distribution among switches. We show that a non-uniform distribution querying strategy that tends to query switches closer to the destination with a higher probability has a better performance compared to the uniform schemes. Our evaluation shows that for a stationary traffic matrix OpenTM normally converges within ten queries which is considerably faster than existing traffic matrix estimation techniques for traditional IP networks.

Today's online social networking (OSN) sites do little to protect the privacy of their users' social networking information. Given the highly sensitive nature of the information these sites store, it is understandable that many users feel victimized and disempowered by OSN providers' terms of service. We presents Lockr, a system that improves the privacy of centralized and decentralized online content sharing systems. Lockr offers three significant privacy benefits to OSN users. First, it separates social networking content from all other functionality that OSNs provide. This decoupling lets users control their own social information: they can decide which OSN provider should store it, which third parties should have access to it, or they can even choose to manage it themselves. Such flexibility better accommodates OSN users' privacy needs and preferences. Second, Lockr ensures that digitally signed social relationships needed to access social data cannot be reused by the OSN for unintended purposes. This feature drastically reduces the value to others of social content that users entrust to OSN providers. Finally, Lockr enables message encryption using a social relationship key. This key lets two strangers with a common friend verify their relationship without exposing it to others, a common privacy threat when sharing data in a decentralized scenario. We integrated Lockr with Flickr, a centralized OSN, and BitTorrent, a decentralized one. Our implementation demonstrates Lockr's critical primary benefits for privacy as well as its secondary benefits for simplifying site management and accelerating content delivery. These benefits were achieved with negligible performance cost and overhead.

Education
Courses
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