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PII Masking Before LLM Calls: The Minimal Gateway Pattern

Generative AILLM SecurityData Privacy

February 10, 2026

6 min read

PII Masking Before LLM Calls: The Minimal Gateway Pattern

Most generative AI integrations leak by design: sensitive customer data reaches external model APIs while relying on vendor privacy promises. Here is how we build a minimal, reversible PII masking gateway that guarantees privacy at the network boundary.