Kai Zhou

     Assistant Professor
     Department of Computing
     The Hong Kong Polytechnic University

     Office: PQ836
     Phone: (+852) 2766 7244
     Email: kaizhou@polyu.edu.hk

Navigation: [Home] [Publications]

Selected Publications

author names marked with * are students or RAs under my supervision.


Pre-print Manuscripts:

Provably Robust Adaptation for Language-Empowered Foundation Models
Yuni Lai*, Xiaoyu Xue*, Linghui Shen, Yulun Wu, Gaolei Li, Song Guo, Kai Zhou, Bin Xiao
arXiv, 2025

SparseDoctor: Towards Efficient Chat Doctor with Mixture of Experts Enhanced Large Language Models
Jianbin Zhang, Yulin Zhu, Wai Lun Lo, Richard Tai-Chiu Hsung, Harris Sik-Ho Tsang, Kai Zhou
arXiv, 2025

SEASONED: Semantic-Enhanced Self-Counterfactual Explainable Detection of Adversarial Exploiter Contracts
Xing Ai*, Shudan Lin, Zecheng Li, Kai Zhou, Bixin Li, Bin Xiao
arXiv, 2025

AuditVotes: A Framework Towards More Deployable Certified Robustness for Graph Neural Networks
Yuni Lai*, Yulin Zhu, Yixuan Sun*, Yulun Wu*, Bin Xiao, Gaolei Li, Jianhua Li, Kai Zhou
arXiv, 2025


GraphProt: Certified Black-box Shielding against Backdoored Graph Models
Xiao Yang*, Yuni Lai*, Kai Zhou, Gaolei Li, Jianhua Li, and Hang Zhang
The 34th International Joint Conference on Artificial Intelligence (IJCAI), Montreal, Canada, Aug. 16-22, 2025

Crowdsourced Homophily Ties Based Graph Annotation Via Large Language Model
Yu Bu*, Yulin Zhu*, and Kai Zhou
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, 2025

HyperTTC: Hypergraph-Empowered Tactic-Specific Traffic Clustering for Atomized APT Detection
Wenhui Du, Yuanhang He, Gaolei Li, Xiao Yang*, Jianhua Li, Ge Ren, and Kai Zhou
2025 International Conference on Computing, Networking and Communications (ICNC), pp. 318-322. IEEE, 2025
Best Paper Award

Robust Graph Contrastive Learning with Information Restoration
Yulin Zhu*, Xing Ai*, Yevgeniy Vorobeychik, and Kai Zhou
IEEE Transactions on Information Forensics and Security (TIFS), 2025

SOPA: Sensitivity-Oriented Poisoning Attack for Self-Supervised Graph Embedding Model via Bilevel Evolutionary Optimization
Shen You*, Kai Zhou, Zhongshen Li, Kay Chen Tan, Qiuzhen Lin, and Xiangtao Li
IEEE Transactions on Evolutionary Computation, 2025

Exploring Graph Neural Backdoors in Vehicular Networks: Fundamentals, Methodologies, Applications, and Future Perspectives
Xiao Yang*, Gaolei Li, Kai Zhou, Jianhua Li, Xingqin Lin, and Yuchen Liu
IEEE Open Journal of Vehicular Technology (2025), Volume:6, pp: 1051 - 1071
Featured Article in July 2025

Coupled-Space Attacks Against Random-Walk-Based Anomaly Detection
Yuni Lai*, Marcin Waniek, Liying Li*, Jingwen Wu*, Yulin Zhu*, Tomasz P. Michalak, Talal Rahwan, and Kai Zhou
IEEE Transactions on Information Forensics and Security (TIFS), 2024

AuditVotes: a Framework towards Deployable Certified Robustness for GNNs
Yuni Lai*, Kai Zhou
The ACM Conference on Computer and Communications Security (CCS), Poster, 2024

Adversarial Analysis of Similarity-Based Sign Prediction
Michal Tomasz Godziszewski, Marcin Waniek, Yulin Zhu*, Kai Zhou, Talal Rahwan, Tomasz P Michalak
Artificial Intelligence, Elsevier, 2024

From Bi-level to One-level: Structural Poisoning Attacks against Graph-based Anomaly Detection
Yulin Zhu*, Yuni Lai*, Kaifa Zhao, Xiapu Luo, Mingquan Yuan, Jun Wu, Jian Ren, Kai Zhou
IEEE Transactions on Neural Networks and Learning Systems (TNNLS), 2024

Collective Certified Robustness against Graph Injection Attacks
Yuni Lai*, Bailin Pan*, Kaihuang Chen, Yancheng Yuan, Kai Zhou
41st International Conference on Machine Learning (ICML), 2024

Node-aware Bi-smoothing: Certified Robustness against Graph Injection Attacks
Yuni Lai*, Yulin Zhu*, Bailin Pan*, Kai Zhou
IEEE Symposium on Security and Privacy (IEEE S&P), 2024

Towards Secrecy-Aware Attacks Against Trust Prediction in Signed Social Networks
Yulin Zhu*, Tomasz P Michalak, Xiapu Luo, Xiaoge Zhang, Kai Zhou
IEEE Transactions on Information Forensics and Security (TIFS), 2024

Graph Anomaly Detection at Group Level: A Topology Pattern Enhanced Unsupervised Approach
Xing Ai*, Jialong Zhou*, Yulin Zhu*, Gaolei Li, Tomasz P. Michalak, Xiapu Luo, Kai Zhou
40th International Conference on Data Engineering (ICDE), 2024

Towards Adversarially Robust Recommendation from Adaptive Fraudster Detection
Yuni Lai*, Yulin Zhu*, Wenqi Fan, Xiaoge Zhang, Kai Zhou
IEEE Transactions on Information Forensics and Security (TIFS), 2023

FocusedCleaner: Sanitizing Poisoned Graphs for Robust GNN-based Node Classification
Yulin Zhu*, Liang Tong, Gaolei Li, Xiapu Luo, Kai Zhou
IEEE Transactions on Knowledge and Data Engineering (TKDE), 2023

Hiding from centrality measures: A Stackelberg game perspective
Marcin Waniek, Jan Woznica, Kai Zhou, Yevgeniy Vorobeychik, Tomasz Michalak, Talal Rahwan
IEEE Transactions on Knowledge and Data Engineering (TKDE), 2023

BinarizedAttack: Structural Poisoning Attacks to Graph-based Anomaly Detection
Yulin Zhu*, Yuni Lai*, Kaifa Zhao, Xiapu Luo, Mingquan Yuan, Jian Ren, and Kai Zhou
38th International Conference on Data Engineering (ICDE), 2022

Attacking Similarity-Based Sign Prediction
Michal T. Godziszewski, Marcin Waniek, Yulin Zhu*, Kai Zhou, Talal Rahwan, and Tomasz P. Michalak
21st IEEE International Conference on Data Mining Security (ICDM), 2021

Structural Attack against Graph Based Android Malware Detection
Kaifa Zhao, Hao Zhou, Yulin Zhu*, Xian Zhan, Kai Zhou, Jianfeng Li, Le Yu, Wei Yuan, and Xiapu Luo
ACM SIGSAC Conference on Computer and Communications Security (CCS), 2021

Strategic Evasion of Centrality Measures
Marcin Waniek, Jan Woznica, Kai Zhou, Yevgeniy Vorobeychik, Talal Rahwan, and Tomasz P. Michalak
International Conference on Autonomous Agents and Multiagent Systems (AAMAS), 2021

CASO: Cost-Aware Secure Outsourcing of General Computational Problems
Kai Zhou, and Jian Ren
IEEE Transactions on Services Computing, 2021

Blocking Adversarial Influence in Social Networks
Feiran Jia, Kai Zhou, Charles Kamhoua and Yevgeniy Vorobeychik
11th Conference on Decision and Game Theory for Security (GameSec), 2020

Robust Collective Classification against Structural Attacks
Kai Zhou, Yevgeniy Vorobeychik
36th Conference on Uncertainty in Artificial Intelligence (UAI), 2020

Computing Equilibria in Binary Networked Public Goods Games
Sixie Yu#, Kai Zhou#, P. Jeffrey Brantingham, and Yevgeniy Vorobeychik (# equal contribution)
34th AAAI Conference on Artificial Intelligence(AAAI), 2020

Adversarial Robustness of Similarity-Based Link Prediction
Kai Zhou, Tomasz P. Michalak , and Yevgeniy Vorobeychik
19th IEEE International Conference on Data Mining (ICDM), 2019
One of Best Papers at ICDM'19

Attacking Similarity-Based Link Prediction in Social Networks
Kai Zhou, Tomasz P. Michalak, Marcin Waniek, Talal Rahwan, and Yevgeniy Vorobeychik
International Conference on Autonomous Agents and Multiagent Systems(AAMAS), 2019