Roya Ensafi

Assistant Professor
Computer Science & Engineering,
University of Michigan
Email:  ensafi [@] umich.edu

My research focuses on security and privacy, with an emphasis on designing techniques and systems to protect users from adversarial networks. Much of my work has focused on detecting and defending against adversaries who manipulate Internet traffic in order to block, monitor, or otherwise tamper with users' online activities.

Members of my lab: Reethika Ramesh, Ram Sundara Raman, Leonid Evdokimov, and Elio Qoshi. Alumni include: Victor Ongkowijaya, Adrian Stoll, and Muhammad Ikram.

News:

Prospective Ph.D. students:

Teaching:

Selected Publications

• The Chain of Implicit Trust: An Analysis of the Web Third-party Resources Loading
  M. Ikram, R. Masood, G. Tyson, M. Kaafar, N. Loizon,and R.Ensafi
  In: WWW 2019, May 2019
  
• 403 Forbidden: A Global View of CDN Geoblocking
  A. McDonald, M. Bernhard, B. VanderSloot, W. Scott, J. A. Halderman, and R. Ensafi
  In: ACM IMC , November 2018
  
• Quack: Scalable Remote Measurement of Application-Layer Censorship
  B. VanderSloot, A. McDonald, W. Scott, J. A. Halderman, R. Ensafi
  In: USENIX Security , August 2018
  
• Nation-State Hegemony in Internet Routing
  A. Edmundson,R. Ensafi, N. Feamster, J. Rexford
  In: ACM SIGCAS Conference on Computing and Sustainable Societies, , July 2018
  
• A Look at Infrastructure Geolocation in Public and Commercial Databases
  M. Gharaibeh, A. Shah, B. Huffaker, H. Zhang, R. Ensafi , C. Papadopoulos
  In: ACM IMC , November 2017
  
• Global Measurement of DNS Manipulation
  P. Pearce, B. Jones, F. Li, R. Ensafi , N. Feamster, V. Paxson
  In: USENIX Security, August 2017
  
• Augur: Internet-Wide Detection of Connectivity Disruptions
  P. Pearce* , R. Ensafi* , F. Li, N. Feamster, V. Paxson (* joint first authors)
  In: IEEE Symposium on Security and Privacy (Oakland), May 2017
  
• Identifying and Characterizing Sybils in the Tor Network
  P. Winter, R. Ensafi, K. Loesing, and N. Feamster
  In: USENIX Security Symposium (USENIX Security), August 2016
  
• Examining How the Great Firewall Discovers Hidden Circumvention Servers
  R. Ensafi, D. Fifield, P. Winter, N. Feamster, N. Weaver, and V. Paxson
  In: ACM Internet Measurement Conference (IMC), October 2015
  IRTF Applied Networking Research Prize winner
• Analyzing the Great Firewall of China Over Space and Time
  R. Ensafi, P. Winter, M. Abdullah, and J. Crandall
  In: Privacy Enhancing Technologies Symposium (PETS), July 2015
  
• An Analysis of China's Great Cannon
  B. Marczak, N. Weaver, J. Dalek, R. Ensafi, D. Fifield, S. McKune, A. Rey, J. Railton, R. Deibert, and V. Paxson
  In: USENIX Workshop on Free and Open Communications on the Internet (FOCI), August 2015.
  Also appeared as a Citizen Lab report, April 2015
  

Talks: