PII-Shield – Log Sanitization Sidecar with JSON Integrity (Go, Entropy)
What PII-Shield does: It's a K8s sidecar (or CLI tool) that pipes application logs, detects secrets using Shannon entropy (catching unknown keys like "sk-live-..." without predefined patterns), and redacts them deterministically using HMAC. Why deterministic? So that "pass123" always hashes to the same "[HIDDEN:a1b2c]", allowing QA/Devs to correlate errors without seeing the raw data. Key features: 1. JSON Integrity: It parses JSON, sanitizes values, and rebuilds it. It guarantees valid JSON output for your SIEM (ELK/Datadog). 2. Entropy Detection: Uses context-aware entropy…
In plain words
PII-Shield is a Kubernetes sidecar and CLI tool that automatically detects and redacts sensitive data from application logs using entropy analysis. It identifies secrets like API keys without requiring predefined patterns, then masks them deterministically so the same value always produces the same hash, enabling developers to trace errors without exposing raw data. It parses and rebuilds JSON to maintain valid output for SIEMs like ELK and Datadog, designed to run transparently without impacting application uptime.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
What PII-Shield does: It's a K8s sidecar (or CLI tool) that pipes application logs, detects secrets using Shannon entropy (catching unknown keys like "sk-live-..." without predefined patterns), and redacts them deterministically using HMAC. Why deterministic? So that "pass123" always hashes to the same "[HIDDEN:a1b2c]", allowing QA/Devs to correlate errors without seeing the raw data. Key features: 1. JSON Integrity: It parses JSON, sanitizes values, and rebuilds it. It guarantees valid JSON output for your SIEM (ELK/Datadog). 2. Entropy Detection: Uses context-aware entropy analysis to catch high-randomness strings. 3. Fail-Open: Designed as a transparent pipe wrapper to preserve app uptime. The project is open-source (Apache 2.0). Repo: https://github.com/aragossa/pii-shield Docs: https://pii-shield.gitbook.io/docs/ I'd love your feedback on the entropy/threshold logic!
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