SurrogateShield replaces detected PII with device-local surrogates before LLM API calls and restores originals afterward, achieving 98.87% F1 detection and 13.26 pp higher BERTScore than placeholder redaction while blocking real PII transmission.
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SurrogateShield: Beyond Redaction for High-Utility, Privacy-Preserving LLM Interactions
SurrogateShield replaces detected PII with device-local surrogates before LLM API calls and restores originals afterward, achieving 98.87% F1 detection and 13.26 pp higher BERTScore than placeholder redaction while blocking real PII transmission.