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David A. Wagner

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#artificial intelligence Preprint Jul 2025

Meta-SecAlign: Training LLMs against Prompt Injection for Robust Agents

Meta-SecAlign is proposed for utility-preserving defense by (1) randomized injection position during training to avoid shortcut learning and (2) self-generated responses as high-quality in-distribution training labels as high-quality in-distribution training labels.

Si-Zhe Chen, A. Zharmagambetov, David A. Wagner et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Repeat-After-Me: Black-Box Adaptive Visual Prompt Injection

Prompt injection is widely recognized as a major security threat to AI agents that interact with untrusted external data, such as websites, documents, and emails. Prior work has shown that, in the text domain, black-box prompt injection can achieve near-perfect attack success rates (ASRs). In the image domain, however,...

Si-Zhe Chen, Yu-Lin Tsai, Ivan Evtimov et al. · 1 citation
Preprint Aug 2026

SecOPD: Mitigating Adaptive Prompt Injections by On-Policy Distillation

This paper proposes Secure On-Policy Distillation (SecOPD) that provides token-level feedback to guide defensive fine-tuning, and generalizes to domains completely unseen in training.

Yibo Peng, Long Lian, David A. Wagner et al. · 5 citations · ⚡1

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