Automated Detection of AI-Obfuscated Plagiarism in Modeling Assignments

Plagiarism is a widespread problem in computer science education, exacerbated by the impracticability of manual inspection in large courses. Even worse, tools based on large language models like ChatGPT have made it easier than ever to obfuscate plagiarized solutions. Additionally, most plagiarism detectors only apply to code, and only a few approaches exist for modeling assignments, which lack broad resilience to obfuscation attacks. This paper presents a novel approach for automated plagiarism detection in modeling assignments that combines automated analysis with human inspection. We evaluate our approach with real-world assignments and plagiarism obfuscated by ChatGPT. Our results show that we achieve a significantly higher detection rate for AI-generated attacks and a broader resilience than the state-of-the-art.