Hardware key confinement plus a SHA-256 payload commitment and an LLM judge blocked all 12 tested prompt-injection signing attacks and prevented key exfiltration in the protected setup.
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Hardware Keystores for AI Agent Signing Workflows: A Zero-Trust MCP Enforcement Architecture
Hardware key confinement plus a SHA-256 payload commitment and an LLM judge blocked all 12 tested prompt-injection signing attacks and prevented key exfiltration in the protected setup.