Qi (Alfred) Chen

PhD Candidate

Computer Science and Engineering,

University of Michigan, Ann Arbor


Google Scholar

[News] (02/23/2016) Our WPAD name collision attack paper got into S&P'16! This is a newly-exposed MitM attack vector in the new gTLD era, which can be exploited to launch MitM attack from anywhere on the Internet with only a domain name registration!

[News] (11/29/2015) Our paper on new Android UI deception attacks and defenses got into FC'16!

[News] (10/27/2015) Our Kratos paper on discovering inconsistent security policy enforcement in Android got into NDSS'16!

[News] (07/22/2015) Our PacketGuardian paper got into CCS'15! Visit our website to see full details of packet injection vulnerabilities we found, covering TCP, RTP, and more!

----Packet injection vulnerability detection is one case of identifying attacker-controlled implicit information leaks, a new class of highly-exploitable implicit information leaks coined by this paper.

[News] More...



I'm currently a 5th year Ph.D. student in Computer Science and Engineering at the University of Michigan, Ann Arbor, working with Professor Z. Morley Mao. Before coming to Michigan, I received my B.S. from Computer Science and Technology department of Nanjing University in 2012.

My research interest is network and system security. To solve practical security problems, I would like to use networking and system techniques, as well as machine learning, probability/statistics, etc. The topics I am currently working on include

  • System side-channel attack discovery, vulnerability detection and defense
  • Android system security and privacy
  • Robust software-defined network architecture design, explore new defense mechanisms enabled by SDN/OpenFlow





GPA: 4.0/4.0


Rank: 3/156   GPA: 90.16/100 (overall) 92.5/100 (major)




  • Yunhan Jack Jia, Qi Alfred Chen, Shiqi Wang, Amir Rahmati, Earlence Fernandes, Z. Morley Mao, and Atul Prakash, "ContexIoT: Towards Providing Contextual Integrity to Appified IoT Platforms", To appear in the 24th Network and Distributed System Security Symposium (NDSS’17), San Diego, CA, February 2017. (acceptance rate 16.1% = 68/423) [PDF] [BIB]
  • Yunhan Jack Jia, Qi Alfred Chen, Yikai Lin, Chao Kong, and Z. Morley Mao, "Open Doors for Bob and Mallory: Open Port Usage in Android Apps and Security Implications", To appear in the 2nd IEEE European Symposium on Security and Privacy (Euro S&P’17), Paris, France, April 2017. (acceptance rate 19.6% = 38/194) [PDF] [BIB]
  • Yihua Guo, Feng Qian, Qi Alfred Chen, Z. Morley Mao, and Subhabrata Sen, "Understanding On-device Bufferbloat for Cellular Upload", Proceedings of the 16th ACM SIGCOMM Internet Measurement Conference (IMC’16), Santa Monica, CA, November 2016. (acceptance rate 25.3% = 46/182) [PDF] [BIB]
  • Earlence Fernandes, Qi Alfred Chen, Justin Paupore, Georg Essl, J. Alex Halderman, Z. Morley Mao, and Atul Prakash, "Android UI Deception Revisited: Attacks and Defenses", Proceedings of the 20th International Conference on Financial Cryptography and Data Security (FC'16), Barbados, February 2016. (acceptance rate 26%) [PDF] [BIB]
  • Yuru Shao, Jason Ott, Qi Alfred Chen, Zhiyun Qian, and Z. Morley Mao, "Kratos: Discovering Inconsistent Security Policy Enforcement in the Android Framework", Proceedings of the 23rd Network and Distributed System Security Symposium (NDSS'16), San Diego, United States, February 2016. (acceptance rate 15.4% = 60/389) [PDF] [BIB] [Website]
  • Qi Alfred Chen, Zhiyun Qian, Yunhan Jia, Yuru Shao, and Z. Morley Mao, "Static Detection of Packet Injection Vulnerabilities -- A Case for Identifying Attacker-controlled Implicit Information Leaks", Proceedings of the 22nd ACM Conference on Computer and Communications Security (CCS'15), Denver, United States, October 2015. (acceptance rate 19.8% = 128/646)
  • [PDF] [Slides] [BIB] [Website]
  • Yunhan Jack Jia, Qi Alfred Chen, Z. Morley Mao, Jie Hui, Kranthi Sontineni, Alex Yoon, Samson Kwong, and Kevin Lau, "Performance Characterization and Call Reliability Problem Diagnosis for Voice over LTE", Proceedings of the 21th ACM Annual International Conference on Mobile Computing and Networking (Mobicom'15), Paris, France, September 2015. (acceptance rate 18.4% = 38/207) [PDF] [BIB]
  • Qi Alfred Chen, Haokun Luo, Sanae Rosen, Z. Morley Mao, Karthik Iyer, Jie Hui, Kranthi Sontineni, and Kevin Lau, "QoE Doctor: Diagnosing Mobile App QoE with Automated UI Control and Cross-layer Analysis", Proceedings of the 14th ACM Internet Measurement Conference (IMC'14), Vancouver, Canada, November 2014. (acceptance rate 22.9% = 43/188)
  • [PDF] [Slides] [BIB]
  • Sanae Rosen, Haokun Luo, Qi Alfred Chen, Z. Morley Mao, Jie Hui, Aaron Drake, and Kevin Lau, "Discovering Fine-grained RRC State Dynamics and Performance Impacts in Cellular Networks", Proceedings of the 20th ACM Annual International Conference on Mobile Computing and Networking (Mobicom'14), Maui, United States, September 2014. (acceptance rate 16.4% = 36/220)  [PDF]
  • Yu Stephanie Sun, Lei Xie, Qi Alfred Chen, Sanglu Lu, and Daoxu Chen, "Efficient Route Guidance in Vehicular Wireless Networks", Proceedings of IEEE Wireless Communications and Networking Conference (WCNC'14), Istanbul, Turkey, April 2014.  [PDF] [Slides] [BIB]
  • Wanchun Dou*, Qi Chen*, and Jinjun Chen, "A Confidence-Based Filtering Method for DDoS Attack Defense in Cloud Environment", Future Generation Computer Systems (FGCS), Volume 29, Issue 7, Pages 1838–1850, September 2013. (Indexed by SCI, Impact Factor 2.639)  (* co-first authors)  [PDF] [BIB]
  • Qi Chen, Wenmin Lin, Shui Yu, and Wanchun Dou, "CBF: A Packet Filtering Method for DDoS Attack Defense in Cloud Environment", Proceedings of the 9th IEEE International Conference on Dependable, Autonomic and Secure Computing (DASC'11), Sydney, Australia, December 2011. (Indexed by EI) [PDF] [BIB]
  • Rutao Yang, Qi Chen, Lianyong Qi, and Wanchun Dou, "A QoS Evaluation Method for Personalized Service Requests", Proceedings of International Conference on Web Information Systems and Mining (WISM'11), Taiyuan, China, September 2011. (Indexed by EI Compendex and ISTP) [PDF]


Awards & Honors


Student Travel Grant, Rackham school (2013-2015), USENIX Security (2013-2015), CCS (2015), and NDSS (2016)

3rd place in Annual Code Optimization Contest, CSE dept., University of Michigan (2012)

Graduate Fellowship, CSE dept., University of Michigan (2012)

Top 100 Excellent Undergraduate Students of the Year (top 100 of China), China Computer Federation (2012)

Outstanding Bachelor’s Degree Thesis in Nanjing University (2012) and Jiangsu province (2013)

National Scholarship (top 1.5% of univ.), Ministry of Education of China (2010)

Model Outstanding Student (top 0.3% of univ.), Nanjing University (2011)

1st prize in National Olympiad in Informatics in Provinces (NOIP), Ministry of Education of China (2007, awarded the exemption of national college entrance exam)



My attack videos on YouTube attracted more than 60,000 views (as of 09/07/2014) from all over the world, with a daily peak of more than 17,000 views.

I am a Distinguished Active member of Tau Beta Pi Michigan Gamma (MI-G) Chapter.

I am the founder and was the first leader of the tennis team in the CS dept. in Nanjing University.

I initialized the first Flyer Book for the CS dept. of Nanjing University, guiding students to apply for graduate schools outside China.

In spare time, I like to play tennis/basketball/badminton, watch movies, and travel.



Qi Chen

2260 Hayward Street, Computer Science and Engineering Division, Ann Arbor, MI 48109

phone: (+1)734-834-2916



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