Add OpenObscure to Tools section

On-device privacy firewall for AI agents with FF1 format-preserving
encryption, image redaction, and cognitive firewall.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

README.md

@@ -117,6 +117,7 @@ Contributions are always welcome. Please read the [Contribution Guidelines](CONT
 - [Prompt Fuzzer](https://github.com/prompt-security/ps-fuzz): the open-source tool to help you harden your GenAI applications ![GitHub Repo stars](https://img.shields.io/github/stars/prompt-security/ps-fuzz?style=social)
 - [WhistleBlower](https://github.com/Repello-AI/whistleblower): open-source tool designed to infer the system prompt of an AI agent based on its generated text outputs. ![GitHub Repo stars](https://img.shields.io/github/stars/Repello-AI/whistleblower?style=social)
 - [Open-Prompt-Injection](https://github.com/liu00222/Open-Prompt-Injection): open-source tool to evaluate prompt injection attacks and defenses on benchmark datasets. ![GitHub Repo stars](https://img.shields.io/github/stars/liu00222/Open-Prompt-Injection?style=social)
+- [OpenObscure](https://github.com/openobscure/openobscure) - On-device privacy firewall for AI agents. Encrypts PII with FF1 format-preserving encryption before it reaches the LLM, with image redaction and cognitive firewall for response manipulation.
 - [Agentic Radar](https://github.com/splx-ai/agentic-radar): Open-source CLI security scanner for agentic workflows. ![GitHub Repo stars](https://img.shields.io/github/stars/splx-ai/agentic-radar?style=social)
 
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