Jianjun Chen ( 陈建军)

Assistant Professor, Tsinghua University
FIT 1-213 Tsinghua University, Beijing, China 100084
jianjun [AT] tsinghua.edu.cn
jianjun [AT] icsi.berkeley.edu
cjj [AT] cs.uchicago.edu


Our group always looks for highly-motivated PhD students, master students and interns to join us! Please feel free to contact me if interested.

Research Interests

  • Network security, protocol security, web security, email security
  • Vulnerability discovery, software testing
  • Network measurement


  • Ph.D., Tsinghua University, July 2018

Professional Experience

  • Tsinghua University, Assistant Professor (Oct 2021 - )
  • University of Chicago, Postdoctoral Fellow (Apr 2021 - Sep 2021)
  • UC Berkeley, Postdoctoral Fellow (Aug 2018 - Apr 2021)


  • Distinguished PaperAward, USENIX Security 2020
  • ACM China SIGSAC Doctoral Dissertation Award, ACM China 2019
  • Distinguished PaperAward, Network and Distributed System Symposium (NDSS) 2016
  • NationalScholarship, Ministry of Education, China 2012
  • NationalEndeavorScholarship, Ministry of Education, China 2011

Selected Publications

[1] Jianjun Chen; Vern Paxson; Jian Jiang; Composition Kills: A Case Study of Email Sender Authentication, 29th USENIX Conference on Security Symposium (USENIX Security’20, Distinguished Paper Award).

[2] Run Guo; Weizhong Li; Baojun Liu; Shuang Hao; Jia Zhang; Haixin Duan; Kaiwen Sheng; Jianjun Chen; Ying Liu; CDN Judo: Breaking the CDN DoS Protection with Itself, Proceedings 2020 Network and Distributed System Security Symposium (NDSS’20).

[3] Jianjun Chen; Jian Jiang; Haixin Duan; Tao Wan; Shuo Chen; Vern Paxson; Min Yang; We Still Don’t Have Secure Cross-Domain Requests: an Empirical Study of CORS, 27th USENIX Conference on Security Symposium (USENIX Security’18).

[4] Run Guo; Jianjun Chen; Baojun Liu; Jia Zhang; Chao Zhang; Haixin Duan; Tao Wan; Jian Jiang; Shuang Hao; Yaoqi Jia; Abusing CDNs for Fun and Profit: Security Issues in CDNs’ Origin Validation, IEEE 37th Symposium on Reliable Distributed Systems (SRDS’18, CCF B类).

[5] Fuqing Chen; Haixin Duan; Xiaofeng Zheng; Jian Jiang; Jianjun Chen; Path Leaks of HTTPS Side-Channel by Cookie Injection, International Workshop on Constructive Side-Channel Analysis and Secure Design 2018.

[6] Jianjun Chen; Jian Jiang; Haixin Duan; Nicholas Weaver; Tao Wan; Vern Paxson; Host of Troubles: Multiple Host Ambiguities in HTTP Implementations, 23rd ACM SIGSAC Conference on Computer and Communications Security (CCS’16).

[7] Xiaojing Liao; Kan Yuan; XiaoFeng Wang; Zhongyu Pei; Hao Yang; Jianjun Chen; Haixin Duan; Kun Du; Eihal Alowaisheq; Sumayah Alrwais; Luyi Xing; Raheem Beyah; Seeking Nonsense, Looking for Trouble: Efficient Promotional-Infection Detection through Semantic Inconsistency Search, 2016 IEEE Symposium on Security and Privacy (SP’16).

[8] Jianjun Chen; Jian Jiang; Xiaofeng Zheng; Haixin Duan; Jinjin Liang; Kang Li; Tao Wan; Vern Paxson; Forwarding Loop Attacks in Content Delivery Networks, Proceedings 2016 Network and Distributed System Security Symposium (NDSS’16, Distinguished Paper Award).