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Parsa Rahimi

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Preprint Jul 2026

ScoreShield: Differentially Private Release of Similarity Scores

A perturb-then-project mechanism that adds Gaussian noise calibrated to global sensitivity of the chosen score release regime and then projects the result onto the feasibility set of valid cosine objects, and evaluates the mechanism across RAG, face recognition, semantic retrieval, image similarity, and recommender-system tasks.

Behrooz Razeghi, Parsa Rahimi · 0 citations