AINeutralarXiv – CS AI · 15h ago6/10
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Hidden-State Privacy Has an Empty Middle
Researchers demonstrate that Gaussian mechanisms for hidden-state privacy face a fundamental trade-off, with no configurations achieving both moderate utility and moderate privacy against adaptive attackers. A diagonal inverse-Fisher mechanism emerges as minimax-optimal but sits at the privacy-utility boundary rather than within an achievable middle ground, suggesting future work must redesign architectures rather than optimize within existing Gaussian frameworks.