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Xinfeng Li

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Preprint Sep 2026

Practical Secrets Extraction against Black-box LLMs

Large language models (LLMs) increasingly power autonomous coding agents such as Codex and Claude Code, yet their training corpora may contain confidential credentials exposed in public repositories or collected from private development artifacts, creating risks of memorization and subsequent leakage. Existing extracti...

Shi-Qian Zhao, Si-Wei Jiang, Xin-Feng Li et al. · 0 citations
Preprint Aug 2026

ICO: Enhancing Semantic-Shift Jailbreaks via Iterative Context Optimization

It is revealed that contexts with stronger semantic-shift capabilities are more likely to guide models toward recovering harmful meanings and achieving successful jailbreaks, and a black-box context-aware semantic-shift jailbreak framework with Iterative Context Optimization is proposed.

Hujian Zhu, Yi-Hao Huang, Felix Juefei-Xu et al. · 0 citations
2026

Patronus: Safeguarding Text-to-Image Models Against Adversarial Fine-Tuning

Text-to-image (T2I) models can be exploited to produce unsafe images. Existing safety measures, e.g., content moderation or model alignment, can be weakened by adversaries who attempt to restore unsafe generation through model fine-tuning. This paper presents Patronus, a defensive framework that improves T2I models’ re...

Xin-Feng Li, Sheng-Yuan Pang, Jialin Wu et al. · 0 citations
Preprint Aug 2026

Beyond Over-Refusal: Defending Indirect Prompt Injection via Latent Instruction Manifolds

AEGIS (Adaptive Ensemble Guard for Injection Shielding) extracts instruction-sensitive projectors to identify malicious instructions and leverages a Unified Multi-Layer Consensus mechanism that aggregates topologically distinct signals across the network depth.

Jia-Hao Chen, Ruiping Yin, Xin-Feng Li et al. · 1 citation · ⚡1

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