About me

_{I am currently a fifth-year Ph.D. student at Peking University and very fortunate to be advised by Prof. Qingni Shen. I have been a visiting Ph.D. student at the Nanyang Technological University advised by Prof. Yang Liu since December 2023. I also work closely with Prof. Jiaheng Zhang.}

_{I was a research intern at TSAIL advised by Prof. Hang Su and Dr. Yinpeng Dong from September 2022 to October 2023.}

_{My research mainly focuses on Trustworthy AI, especially backdoor attacks/defenses and adversarial attacks. Recently, I focus more on the vulnerability and privacy issues of Text-to-Image Models and large Language Models. Feel free to drop me an email if you are interested in our work, and I am always willing to work together on interesting projects with external collaborators.}

_{I am actively seeking for a postdoc / full-time researcher position starting in the fall of 2025. Please feel free to contact me at shengfang.zhai AT gmail.com.}

News!

• _{Our paper “Membership Inference on Text-to-Image Diffusion Models via Conditional Likelihood Discrepancy” has been accepted by NeurIPS 2024. See you in Vancouver!}
• _{I will serve as an AEC member of CCS 2024.}
• _{Our paper “Text-to-image Diffusion Models Can be Easily Backdoored through Multimodal Data Poisoning” has been accepted by ACM MM 2023 (Oral).}
• _{Our paper “NCL: Textual Backdoor Defense Using Noise-augmented Contrastive Learning” has been accepted by ICASSP 2023.}

Service

• _{Committee Members:}

  _{CCS AEC 2024,}

• _{Reviewer for Journals:}

  _{IEEE TPAMI, IEEE TNNLS, Elsevier Computer & Security,}

• _{Reviewer for Conferences:}

  _{ICLR, CVPR, ACM MM, AAAI, ACL, AsiaCCS, ECAI, ICASSP, ICICS,}

Teaching

• _{Development of Artificial Intelligence Applications – Teaching Assistant, Spring 2023.}

Competitions

• _{ByteDance Security AI Challenge: Top 2% (Textual Adversarial Attack Track, 2022.10)}

Prestigious Awards

• _{[2023] Academic Innovation Award (Top 1%), Peking University.}
• _{[2023, 2021] Shenzhen Stock Exchange Scholarship, Peking University.}
• _{[2022] Award for Academic Excellence, Peking University.}
• _{[2021] Merit Student, Peking University.}

Bio

• _{[2020-present] Ph.D. Student in Software Engineering, Peking University}
  • _{Supervisor: Prof. Qingni Shen}
• _{[2024.9-present] Research Assistant, National University of Singapore}
  • _{Supervisor: Prof. Jiaheng Zhang}
• _{[2023.12-2024.8] Visiting Ph.D. Student, Nanyang Technological University}
  • _{Supervisor: Prof. Yang Liu}
• _{[2016-2020] B.S. in Computer Science and Technology (Honored Program), China Agricultural University (CAU)}

Personal Life

• _{I enjoy sports, particularly running, and playing basketball with friends.}

Friend Links

• Xin Zhang
• Junkai Liang