SurrogateShield: Beyond Redaction for High-Utility, Privacy-Preserving LLM Interactions
LLM-based assistants transmit user queries verbatim to third-party API endpoints that lie outside the user's audit or control. When those queries contain personally identifiable information (PII), the data persists on remote infrastructure subject to breach, subpoena, or policy change. Placeholder redaction (the prevailing mitigation) suppresses PII at the cost of semantic coherence, producing structurally degraded queries and correspondingly degraded responses. We present SurrogateShield, a client-side proxy that substitutes detected PII with locally generated, type-consistent surrogate values prior to transmission and restores originals in the response. No real PII crosses the network b...
| Authors | Sherwin Vishesh Jathanna |
|---|---|
| Primary category | cs.CR |
| Published | 28 June 2026 |
| Last updated at source | 28 June 2026 |
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