From Review to Authorization: Key-Isolated Threshold Signing for LLM Agents
Autonomous LLM agents can turn untrusted content into effectful actions such as payments and permission changes. If the same process interprets this content and controls a reusable signing credential, prompt injection can cross the judgment boundary and reach execution authority. We present KITA, a review-to-authorization architecture that keeps the user's personal secret signing key and every threshold signing-key share outside all LLM processes. Under threshold signature unforgeability and our system assumptions, compromising the proposer and fewer than t reviewer-signer domains cannot produce a valid authorization for a new action without signing contributions from t distinct domains. ...
| Authors | Yu Zheng, Qizhi Zhang |
|---|---|
| Primary category | cs.CR |
| Published | 5 September 2026 |
| Last updated at source | 5 September 2026 |
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