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Ou-Bo Ma

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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
#artificial intelligence Review Sep 2026

Safety in Self-Evolving Agents: A Survey

SAVER is introduced, a transition-centered framework in which Substrate locates reusable influence, Adaptation captures how it changes, Violation identifies compromised safety attributes, Exposure marks where failures become observable, and Response assesses containment, repair, or revocation.

Jia-Hao Chen, Zhou Feng, Ou-Bo Ma et al. · 1 citation
2026

Action-Level Backdoor Attacks Against Deep Reinforcement Learning Systems via Adaptive Reward Exploration

Deep Reinforcement Learning (DRL) has demonstrated remarkable capabilities in domains such as robotics, finance, and autonomous systems. With the increasing cost of training, DRL models are increasingly shared and reused via model marketplaces, cloud platforms, and open-source repositories. This trend exposes DRL syste...

Ou-Bo Ma, L. Du, Yang Dai et al. · 0 citations
Preprint Sep 2026

The Shape of Ownership: Verifying LLM Provenance through Semantic Structures

This work introduces PROSE (Provenance through Relational Organization of Semantic Expression), replacing fixed query sets with a target semantical domain and brittle response keys with semantic structures internalized as domain-conditioned response behavior.

Zhong-Rui Sun, Jia-Hao Chen, Ou-Bo Ma et al. · 0 citations
#artificial intelligence Review May 2026

IntraGuard: Committee-Side Defenses Against Review Outsourcing to Commercial Chatbots

IntraGuard is proposed, a black-box, venue-agnostic defense framework grounded in the structural--visual decoupling inherent to the PDF that achieves a defense success rate of up to 84%, while preserving peer-review invariance for human reviewers.

Ou-Bo Ma, Rui-Xiao Lin, Jia-Hao Chen et al. · 2 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
#artificial intelligence Book Feb 2024

SUB-PLAY: Adversarial Policies against Partially Observed Multi-Agent Reinforcement Learning Systems

This study unveils the capability of attackers to generate adversarial policies even when restricted to partial observations of the victims in multi-agent competitive environments, and proposes a novel black-box attack (SUB-PLAY) that incorporates the concept of constructing multiple subgames to mitigate the impact of...

Oubo Ma, Yuwen Pu, L. Du et al. · 16 citations

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