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Zhifang Zhang

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#small language model Preprint Oct 2026

Purifying Backdoored Large Vision-Language Models by Removing Hijacked Directions

OrthoPurify is proposed, a more efficient method to purify backdoored model weights via one-step orthogonal projection, which reduces the attack success rate to near zero while preserving the original performance across diverse benchmarks, without retraining the backdoored model or introducing inference-time overhead.

Bo Yang, Hao-Chen Zhou, Zhi-Fang Zhang et al. · 0 citations
Preprint Aug 2026

When Agents Learn to Be You: Benchmarking Privacy Leakage, Impersonation Risk, and Defenses in Persona Skills

AntiSkillBench is introduced, an end-to-end benchmark for evaluating risks and defenses across the persona-skill pipeline, and experiments show that persona-skill risks persist across agent backbones and distillation protocols, extending from explicit attributes to communication styles and personality traits.

Yongli Xiang, Zhi-Fang Zhang, Bojun Yang et al. · 2 citations

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