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Xinhang Ma

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#artificial intelligence Preprint Jun 2026

AutoDojo: A Generative Benchmark for Evaluating Prompt Injection Defenses in LLM Agents

AutoDojo is introduced, a generative benchmark built on AgentDojo and AgentDyn that generates IPI adaptively for a given agent and defense, and it is demonstrated that standard static benchmarks often significantly overestimate defense efficacy.

Xinhang Ma, Taoran Li, Chao-Wei Xiao et al. · 5 citations
Preprint Aug 2026

ROPE: Routed Origin Policy Enforcement against Indirect Prompt Injection

ROPE is presented, which is anchored in a structural notion of trust, and holds attack success rate to 1.6--2.6 while retaining 82--100% of undefended clean utility, significantly exceeding state-of-the-art system-level defenses in utility while attaining comparable or better security.

Xinhang Ma, Chao-Wei Xiao, William Yeoh et al. · 3 citations · ⚡2
Preprint Aug 2026

Robust Context-Aware Detection of Malicious Instructions in Text

The proposed approach for malicious sentence classification that is both context- and query-aware and outperforms state-of-the-art IPI defense baselines under static attacks, while in the case of adaptive attacks, the AT variants provide significantly higher utility, lower attack success rate, and often both.

Buzhao Liu, Xinhang Ma, Yevgeniy Vorobeychik · 1 citation

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