Author

Yuan Zhang

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Book Open access Aug 2026

Scalable Exact Path Selection via Structure-Aware Search for Virtual Payment Channels

Virtual Payment Channels (VPCs) enable efficient off-chain transactions in Payment Channel Networks (PCNs), but their performance depends on selecting high-quality underlying paths. Existing approaches either rely on simplified metrics or incur high computational cost. We study VPC path selection under generalized mono...

Jian-Feng Luo, Zhe-Bei Shen, Yuan Zhang et al. · Proceedings of the Internati... · 1 citation

#small language model Preprint Aug 2026

Mitigating Database Leakage in RAG Systems with Keyword-Grounded Fact Substitution

KFS-RAG is proposed, a defense that mitigates information leakage by reformulating the retrieved context by identifying a small set of influential keywords from the retrieved context via an attention rollout plus a causal perturbation mechanism.

Ziliang Zhang, Yu-Bo Zhu, Wei Tong et al. · 0 citations

Preprint Aug 2026

PURPOSE: Poisoning Conflict Resolution in RAG via Proxy-Fact-Grounded Updates

PURPOSE is proposed, a strict black-box poisoning attack that reframes the injection as an update that minimizes conflict, rather than as a counter-claim, and identifies non-contradicting injection as a practical mode to enhance poisoning attack.

Zijian Wang, Yubo Zhu, M. Dong et al. · 0 citations