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cs.CR2026
MoSign: Challenge-Response Motion-Watermark Authentication for Anonymous Virtual-Reality Users
Xujun Che, Thomas Carr, Depeng Xu +2
Social virtual reality (VR) creates a paradox. A user's body motion is a high-entropy biometric: head and hand trajectories alone re-identify users among tens of thousands with ove…
cs.CR2026
Memorization Is Not Extraction: Tight Differential-Privacy Bounds and Audit Blind Spots
Xujun Che, Depeng Xu, Shuhan Yuan
Memorization in large language models is measured through a zoo of definitions whose formal relations are unknown, and differential privacy (DP) is treated as a proxy against all o…