Author

Chun-Qiang Hu

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Preprint Oct 2026

Sleeping Secrets: How Fine-Tuning Reawakens Privacy Risks in Language Models

This work proposes ReGap, a data-free attack that recovers private associations using task structure, filters them by answer-token likelihood, and updates the target model via low-rank adaptation, which requires neither target answers nor auxiliary genuine private supervision.

Jian-Hong Li, Jia-Hao Chen, Yuwen Pu et al. · 0 citations

Preprint Sep 2026

A Finger on the Scale: Covert Policy Steering through Agentic Skills

SkillShift is presented, a constrained black-box framework for covert policy steering without explicit target command injection or task hijacking that combines semantically plausible policy edits with hierarchical validation, failure-guided optimization, and strategy compression to preserve effectiveness, output validi...

Jia-Rui Li, Jia-Hao Chen, Chun-Yi Zhou et al. · 0 citations