Jiacheng Liang

About Me

I am a Ph.D. candidate at Stony Brook University, supervised by Dr. Ting Wang.

Research Interests

My expertise is in ensuring the Safety and Trustworthiness of Large Language Models (LLMs). I work on identifying Security Challenges and developing Defensive Strategies to protect these models from adversarial threats. My recent work includes:

• Security Challenges – Investigate vulnerabilities in LLM watermarking and GraphRAG; jailbreak reasoning model and propose advanced methods to address these weaknesses.
• Defensive Strategies – Develop methods to defend against backdoor attacks* (self-defense mechanisms in agent) and jailbreaking (Data curation when finetuning and KV eviction when inference).

In addition, I possess extensive expertise and a strong interest in post-training, prompt engineering, inference optimization, LLM agents, and ensuring LLM alignment.

Recent Publications (Full List)

• GraphRAG under Fire
  Jiacheng Liang, Yuhui Wang, Changjiang Li, Rongyi Zhu, Tanqiu Jiang, Neil Gong, Ting Wang

• WaterPark: A Robustness Assessment of Language Model Watermarking
  Jiacheng Liang, Zian Wang, Lauren Hong, Shouling Ji, Ting Wang

• RobustKV: Defending Large Language Models against Jailbreak Attacks via KV Eviction
  Tanqiu Jiang, Zian Wang, Jiacheng Liang, Changjiang Li, Yuhui Wang, Ting Wang
  International Conference on Learning Representations (ICLR’25)

• Model Extraction Attacks Revisited
  Jiacheng Liang, Ren Pang, Changjiang Li, Ting Wang
  Asia Conference on Computer and Communications Security (Asia CCS’24)

• Data to Defense: The Role of Curation in Customizing LLMs Against Jailbreaking Attacks
  Xiaoqun Liu*, Jiacheng Liang*, Luoxi Tang, Muchao Ye, Weicheng Ma, Zhaohan Xi

Collaborators and Previous Advisors

Teammates at ALPS-Lab: Ren Pang (Amazon), Zhaohan Xi (Binghamton University), Changjiang Li, Tanqiu Jiang, Zian Wang, Yuhui Wang, Rongyi Zhu

Previous Collaborators: Bochuan Cao (PSU), Qihua Zhou (SZU), Yanjing Ren (CUHK), Guoli Wei (USTC), Zicong Hong (HKUST), Jun Pan (HKPolyU)

Previous Advisors: Jingwei Li (UESTC), Song Guo (HKUST), Songze Li (SEU, HKUST)

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