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Trail of Bits Blog · November 6, 2026

Signing services: test whether valid requests can grant lasting authority

analysis Agent SecurityAI Red TeamingAI Engineering
Why it matters

Trail of Bits explains why protecting a private key does not prevent misuse of a service authorized to request signatures. Its checklist covers delegation, alternative execution paths, independent safeguards and monitoring of authority changes. The guidance is relevant to systems where compromised tools or credentials can reach a signing service.

My takeaway: Inventory signature-request paths and test them with the permissions of a compromised client. Treat delegation as an administrative change, verify that generic signing APIs cannot bypass restrictions, and check both immediate asset movement and future authority. Retain evidence that prohibited requests produce no usable signature.
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