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Jun Dai

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Preprint Aug 2026

Measuring the Wrong Thing: Internal Harmfulness Scores Anti-Rank Successful Jailbreaks

Internal safety scores judge a prompt before any text is generated, and they are validated by how well they separate harmful prompts from benign ones. That separation is then read as evidence that the score will also catch the attacks that succeed. Harmful intent is a property of the prompt. Jailbreak success is an out...

Ming-Yu Luo, Ming Deng, Zilang Qiu et al. · 0 citations
Preprint Sep 2026

PixCrypt: Fast Fine-Grained FHE with Range-Aware Caching

Many analytics tasks require secure computation over encrypted data. In particular, fine-grained data such as pixel-level images require higher precision, as every pixel can directly affect outcomes in tasks like tumor segmentation and anomaly detection. While Multi-Party Computation (MPC) is interactive, Differential...

Chao Wang, Shu-Bing Yang, Xiao-Yan Sun et al. · 0 citations
#small language model Review Sep 2026

Detecting and Localizing Segment-Level Poisoning in Multi-Source LLM-Agent Inputs

ActProbe, an internal-state-based framework for detecting and localizing poisoned segments in multi-source LLM inputs, is proposed and remains effective against defense-aware adaptive attacks and can protect black-box APIs through surrogate-based poisoned-segment removal.

Xue Tan, Chang-Hui Wang, Sanrui Yang et al. · 0 citations
Jul 2026

When Agents Go Rogue: Activation-Based Detection of Malicious Behaviors in Multi-Agent Systems

AcMAS is proposed, an activation-based framework for malicious-behavior detection in MAS that significantly outperforms graph-based baselines against stealthy attacks, with generalization across diverse open-source LLM backbones, attack intensity, and MAS scale.

Haowen Xu, Xue Tan, Lei Ma et al. · 0 citations

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