arxivcs.CRcs.AI2026-07-12
PromptGraph: Graph-Guided Prompt Sanitization for Balancing Privacy and Utility in LLM Inference
Chen Gu, Hui Wan, Donghui Hu, Hui Wang, Zhuoer Gu
Large Language Model (LLM) services introduce a fundamental privacy challenge. Sensitive information may be inferred not only from explicit identifiers, such as names or phone numbers, but also from contextual associations among otherwise innocuous spans. Existing sanitizers typi…