Jiyi Zhang

About Me

I am a Machine Learning Engineer at TikTok, with a Ph.D. from the National University of Singapore. My work bridges research and industry, with a focus on building robust and secure AI systems. My research interests include diffusion models, large language models, graph-based learning, digital watermarking, and AI security. In the industry, I have applied these areas to real-world systems, contributing to recommendation systems, content moderation, and risk detection.

Publications

1. Mitigating Adversarial Attacks by Distributing Different Copies to Different Buyers
   Jiyi Zhang, Han Fang, Wesley Joon-Wie Tann, Ke Xu, Chao Fang, Ee-Chien Chang
   Proceedings of the 2023 ACM on Asia Conference on Computer and Communications Security (AsiaCCS)
2. Confusing and Detecting ML Adversarial Attacks with Injected Attractors
   Jiyi Zhang, Ee-Chien Chang, Hwee Kuan Lee
   Proceedings of the 2022 ACM on Asia Conference on Computer and Communications Security (AsiaCCS)
3. Common Component in Black-Boxes Is Prone to Attacks
   Jiyi Zhang, Wesley Joon-Wie Tann, Ee-Chien Chang, Hwee Kuan Lee
   26th European Symposium on Research in Computer Security (ESORICS)
4. Finding Input Data Domains of Image Classification Models with Hard-Label Black-Box Access
   Jiyi Zhang, Han Fang, Ee-Chien Chang
   Proceedings of the 32nd ACM International Conference on Multimedia, 2024 (MM)
5. Neural Network Inversion in Adversarial Setting via Background Knowledge Alignment
   Ziqi Yang, Jiyi Zhang, Ee-Chien Chang, Zhenkai Liang
   Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security (CCS)
6. Tracing the origin of adversarial attack for forensic investigation and deterrence
   Han Fang, Jiyi Zhang, Yupeng Qiu, Jiayang Liu, Ke Xu, Chengfang Fang, Ee-Chien Chang
   IEEE/CVF International Conference on Computer Vision, 2023 (ICCV)
7. Flow-Based Robust Watermarking with Invertible Noise Layer for Black-Box Distortions
   Han Fang, Yupeng Qiu, Kejiang Chen, Jiyi Zhang, Weiming Zhang, Ee-Chien Chang
   Proceedings of the AAAI Conference on Artificial Intelligence, 2023 (AAAI)
8. De-END: Decoder-driven Watermarking Network
   Han Fang, Zhen Jia, Yupeng Qiu, Jiyi Zhang, Weiming Zhang, Ee-Chien Chang
   IEEE Transactions on Multimedia, 2022 (TMM)
9. DP 2 Dataset Protection by Data Poisoning
   Han Fang, Yupeng Qiu, Guorui Qin, Jiyi Zhang, Kejiang Chen, Weiming Zhang, Ee-Chien Chang
   IEEE Transactions on Dependable and Secure Computing, 2024 (TDSC)

Patents

1. Interactive Silent Liveness Detection
   Jiyi Zhang, Quan Jin Ferdinand Tang
   US Patent 11,922,732, 2024
2. Watermark as Honeypot for Adversarial Defense
   Jiyi Zhang
   US Patent 11,501,136, 2022
3. Automatic document processing
   Quan Jin Ferdinand Tang, Jiyi Zhang, Xiaodong Yu, et al.
   US Patent 11,455,713, 2022
4. Ensemble Method for Face Recognition Deep Learning Models
   Xiaodong Yu, Quan Jin Ferdinand Tang, Jiyi Zhang, Yuzhen Zhuo
   US Patent 11,689,526, 2023
5. Image forgery detection via headpose estimation
   Xiaodong Yu, Jiazheng Zhang, Jiyi Zhang, et al.
   US Patent 12,067,475, 2024
6. Removing Clarity Issues From Images To Improve Readability
   Jiyi Zhang
   US Patent App. 17/645,484, 2023
7. Real-time Media Alteration Using Generative Techniques
   Jiyi Zhang, Zhe Chen, Jiazheng Zhang, et al.
   US Patent App. 18/512,007, 2023
8. Fraud Detection for Signed Documents
   Quan Jin Ferdinand Tang, Jiyi Zhang, Jiazheng Zhang, et al.
   US Patent App. 18/051,580, 2024
9. Document Similarity Learning by Heterogeneous Group Relationships
   Zhe Chen, Jiyi Zhang, Quan Jin Ferdinand Tang
   US Patent App. 18/461,299, 2023
10. Seller Risk Detection by Product Community and Supply Chain Modelling
    Zhe Chen, Jiyi Zhang, Ting Lin, Quan Jin Ferdinand Tang
    US Patent App. 18/082,870, 2022
11. Two-Sided Machine Learning Framework for Pointer Movement-Based Bot Detection
    Zhe Chen, Jiyi Zhang, Hewen Wang, et al.
    US Patent App. 18/146,738, 2022
12. Detection of Physical Tampering on Documents
    Jiazheng Zhang, Yuzhen Zhuo, Jiyi Zhang
    US Patent App. 17/850,602, 2023
13. Image Forgery Detection via Pixel-Metadata Consistency Analysis
    Shanshan Peng, Jiazheng Zhang, Jiyi Zhang, et al.
    US Patent App. 17/374,439, 2023
14. Machine Learning Model for Image Forgery Detection
    Zhe Chen, Panpan Qi, Jiazheng Zhang, Jiyi Zhang, Quan Jin Ferdinand Tang
    US Patent App. 18/189,044, 2023