Changjia Zhu

I am a Ph.D. student in Computer Science at the Bellini College of Artificial Intelligence, Cybersecurity, and Computing (CAICC) at the University of South Florida.

My work studies the security risks and misuse of modern AI systems and large-scale network infrastructures. In particular, I investigate vulnerabilities in LLM-based systems, Wi-Fi geolocation services, and serverless computing platforms.

Research Interests

• Security and misuse of large language models
• Wi-Fi positioning system security
• Co-location risks in Function-as-a-Service (FaaS) platforms

Education

• Ph.D. in Computer Science & Engineering, University of South Florida, Tampa, FL
  Jan 2023 – Present

• M.S. in Inorganic Chemistry, University of North Texas, Denton, TX Aug 2021 – Dec 2022

• B.S. in Material Chemistry, University of Science and Technology of China, Hefei, China
  Aug 2016 – Jun 2020

News

• [Dec 2025] Our paper WILD Attack: Stealthy Undermining of Wi-Fi-Based Geolocation Through Remote Crowdsourced Data Injection was accepted to USENIX Security 2026.

• [Aug 2025] Our paper Invisible Prompts, Visible Threats: Malicious Font Injection in External Resources for Large Language Models was accepted to EMNLP 2025 Findings.