What Is PII Redaction, and Where Does It Actually Need to Happen?
2026-07-29 · 3 min read
PII redaction means detecting and removing personally identifiable information — credit card numbers, SSNs, emails, phone numbers, API keys — before it reaches a place it shouldn't be.
Where PII leaks by default
Most PII exposure isn't a dramatic breach. It's a support ticket with a customer's card number in it, forwarded automatically to a logging tool that keeps everything forever. Or a webhook payload sent to a third-party service that never needed to see the raw value. Or, increasingly, a prompt sent to an AI/LLM system as part of an automated workflow.
Detection alone isn't enough
Knowing PII exists somewhere in your logs after the fact doesn't undo the exposure. The redaction has to happen before the data leaves — at the point where a request is about to be forwarded to a log file, an API, or an AI system.
Mask vs. reversible hash
Two common approaches: replace the value with a fixed placeholder (mask), or replace it with a reversible token you can look up later if genuinely needed (hash). Which one makes sense depends on whether anything downstream legitimately needs the original value back.
How KlaroShield approaches this
KlaroShield sits in front of your existing upstream as a proxy — no SDK integration, typically a base URL change — and redacts credit cards, SSNs, emails, phone numbers and API keys before they reach logs, third-party APIs, webhooks, or AI/LLM calls.