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arXiv · 2610.27213

Profile-DP: Differential Privacy for User-Controlled Profile Release in Personalized LLM Inference

Mingchen Li·Zifan Peng·Kewei Sha·Lavinia F Pieptea·Heng Fan·Junhua Ding·Meikang Qiu·Yunhe Feng
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Abstract

Personalized large language models (LLMs) increasingly rely on profile-conditioned inference, pairing public requests with rich, user-specific facts. This paradigm exposes the user profile itself, together with the user's explicit sharing preferences. We introduce Profile-DP, a policy-aware local differential privacy framework designed specifically for user-profile release in personalized LLM inference. Profile-DP provably bounds the release of user-withheld facts while treating public instructions, profile schemas, and authorized facts as public side information. By generating a privatized profile that composes with the public instruction prior to answer generation, our framework decouples formal privacy guarantees from downstream model behavior. We develop two finite-domain mechanisms satisfying Profile-DP: DP-SLOT independently perturbs protected attributes, while DP-BLOCK uses public semantic decisions to coordinate their release and jointly sample related attributes. A positive, public compatibility prior connects these attributes while preserving a profile-level privacy bound. On PEEP, DP-BLOCK leads the utility composite among DP methods at all 13 structured budgets and is closest to the ideal privacy--utility point in 18 of 26 format--budget settings under our composite weighting. Direct measurements reveal complementary strengths: DP-BLOCK discloses less, while DP-SLOT retains more authorized facts. These results make policy-aware profile release a practical basis for studying privacy and personalization.

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Mingchen Li, Zifan Peng, Kewei Sha, Lavinia F Pieptea, Heng Fan, Junhua Ding, Meikang Qiu, Yunhe Feng. 2026-10-19. Profile-DP: Differential Privacy for User-Controlled Profile Release in Personalized LLM Inference. https://arxiv.org/abs/2610.27213

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