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Hanwen Wang

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Preprint Aug 2026

Caliber: Cross-Architecture Extraction-Cost Control for Score-Returning APIs

We present Caliber, an output-perturbation defense against model extraction that formulates noise selection as a calibration problem: how much the defense degrades the supervision signal used to train a surrogate, and the provable per-input query cost of recovering the clean logits. To defend against an attacker that u...

Chi Wang, Hanwen Wang, Yuchen Xia et al. · 0 citations

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