Author

Zichun Su

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Book Open access Aug 2026

ActivationBackdoor: Backdooring Large Language Models in Collaborative Inference via Intermediate Activations

This work proposes ActivationBackdoor, an inference-time backdoor attack that composes two activation-level components for trigger detection and backdoor behavior injection, and shows that ActivationBackdoor attains attack success comparable to training-time backdoor baselines while preserving high clean-task accuracy...

Zichun Su, Mi Zhang, Xiaohan Zhang et al. · Proceedings of the 32nd ACM... · 0 citations

Book Open access Aug 2026

ActivationBackdoor: Backdooring Large Language Models in Collaborative Inference via Intermediate Activations

Collaborative inference enables cost-effective deployment of large language models by partitioning layers across multiple participants and forwarding intermediate activations between participants in a pipeline, but these transmitted activations also create a new attack surface: a malicious participant can manipulate in...

Zichun Su, Mi Zhang, Xiaohan Zhang et al. · Proceedings of the 32nd ACM... · 0 citations