hi@zhangchen
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Publications (see Google Scholar for the lastest update)

* denotes equal contribution

Preprints & Under Review

Magpie: Alignment Data Synthesis from Scratch by Prompting Aligned LLMs with Nothing

Zhangchen Xu, Fengqing Jiang, Luyao Niu, Yuntian Deng, Radha Poovendran, Yejin Choi, Bill Yuchen Lin

Paper / website / Huggingface / Code / Demo

CleanGen: Mitigating Backdoor Attacks for Generation Tasks in Large Language Models

Yuetai Li, Zhangchen Xu, Fengqing Jiang, Luyao Niu, Dinuka Sahabandu, Bhaskar Ramasubramanian, Radha Poovendran

Paper / Code

ChatBug: A Common Vulnerability of Aligned LLMs Induced by Chat Templates

Fengqing Jiang, Zhangchen Xu, Luyao Niu, Bill Yuchen Lin, Radha Poovendran

Paper / Code

Distributed Consensus Network: A Universal Modularized Communication Framework and Reliability Probabilistic Analysis

Yuetai Li, Zhangchen Xu, Zihan Zhou, Jon Crowcroft, Lei Zhang

2024

ACE: A Model Poisoning Attack on Contribution Evaluation Methods in Federated Learning

Zhangchen Xu, Fengqing Jiang, Luyao Niu, Jinyuan Jia, Bo Li, Radha Poovendran

in Proc. of Usenix Security 2024

Paper

SafeDecoding: Defending against Jailbreak Attacks via Safety-Aware Decoding

Zhangchen Xu, Fengqing Jiang, Luyao Niu, Jinyuan Jia, Bill Yuchen Lin, Radha Poovendran

in Proc. of ACL 2024 (Main)

Also presented at SET LLM @ ICLR 2024

Paper / Code / Poster

ArtPrompt: ASCII Art-based Jailbreak Attacks against Aligned LLMs

Fengqing Jiang*, Zhangchen Xu*, Luyao Niu*, Zhen Xiang, Bhaskar Ramasubramanian, Bo Li, Radha Poovendran

in Proc. of ACL 2024 (Main)

Also presented at SET LLM @ ICLR 2024

Paper / Code / Poster

Brave: Byzantine-Resilient and Privacy-Preserving Peer-to-Peer Federated Learning

Zhangchen Xu*, Fengqing Jiang*, Luyao Niu, Jinyuan Jia, Radha Poovendran

in Proc. of AsiaCCS 2024 (Poster)

Also presented at PPAI Workshop @ AAAI 2024

Paper / Poster

2023

Identifying and Mitigating Vulnerabilities in LLM-Integrated Applications

Fengqing Jiang, Zhangchen Xu, Luyao Niu, Boxin Wang, Jinyuan Jia, Bo Li, Radha Poovendran

in Proc. of AsiaCCS 2024 (Poster)

Also presented at Instruction Workshop @ NeurIPS 2023

Paper / Poster

Exact Fault-Tolerant Consensus with Voting Validity

Zhangchen Xu, Yuetai Li, Chenglin Feng, Lei Zhang

in Proc. of IPDPS 2023 (Oral)

Paper / Slides

Wireless Distributed Consensus in Vehicle to Vehicle Networks for Autonomous Driving

Chenglin Feng, Zhangchen Xu, Xincheng Zhu, Paulo Valente Klaine, Lei Zhang

IEEE Transactions on Vehicular Technology, 2023

Paper