arXiv AI By Yixiang Luo, Ziheng Ma, Ke Chang, Jian Wang, Jiqiang Liu

When Safety Checks Become Privacy Risks: A Privacy-Preserving Paradigm for LLM Agent Safety Auditing

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The paper introduces a privacy‑preserving safety auditing paradigm for large language model agents that interact with online services via tool calls. It separates audit computation from plaintext access, using trusted representation construction, encrypted audit computation, and trusted decision interfaces to protect sensitive user data. The authors implement this paradigm in SealCall, which employs learned audit representations and CKKS‑based encrypted similarity computation, achieving a mean F1 score of 0.840 on 1,252 public binary candidates while maintaining plaintext audit decisions and completing encrypted scoring in 0.176 s.

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arXiv Machine Learning
Aug 31

Not to Break, but to Attest: Adversarial Probes for Privacy-Preserving LLM Verification

The paper introduces a privacy‑preserving zk‑SNARK audit framework that uses adversarial‑style probes to detect logit drift between an approved large language model and a modified deployment. It offers three probe families—token‑based (black‑box), embedding‑based (gray‑box), and stress probes (partial white‑box)—allowing users to balance sensitivity, access, and cost. Experiments across LLM architectures and GPU platforms show token‑based probes achieve the highest mean sensitivity while remaining practical in a black‑box setting, with Groth16 proving times scaling modestly from 1.02 to 1.78 seconds and constant proof size.

By Cameron Wilding, Mina Shaker, Fatemeh Ganji