Say Something Else: Rethinking Contextual Privacy as Information Sufficiency

Researchers formalize privacy-preserving communication for LLM agents by introducing Information Sufficiency (IS) as a framework and proposing free-text pseudonymization as a third privacy strategy alongside suppression and generalization. Evaluation across 792 scenarios reveals that pseudonymization offers superior privacy-utility tradeoffs, and that multi-turn conversational testing exposes significant privacy leakage missed by single-message assessments.