LLM Trust & Safety Framework: Building a Multi-Layered Security Protection System for Generative AI Applications

The LLM Trust & Safety Framework is an academic security framework released by D3Z33 on GitHub in May 2026, aiming to build comprehensive security protection for generative AI applications. Through core modules such as InputGuard, OutputGuard, and SessionWatch, it covers input validation, output desensitization, session monitoring, and risk scoring, addressing the protection blind spots of traditional security models at the natural language level and establishing a verifiable trust barrier between the application layer and the model layer.

Traditional security models (e.g., firewalls, WAF) have obvious blind spots in LLM applications: variants of natural language input are hard to detect via signature-based methods, dynamic outputs may contain sensitive content, and progressive attacks in multi-turn sessions cannot be detected at a single point. The framework identifies five core risks for LLM applications: prompt injection attacks, sensitive information leakage, improper output handling, session abuse, and excessive agency.

The framework’s core concept is 'trust but verify', inserting a security middle layer between the application and the model. Key modules include: InputGuard (in-depth input analysis to identify injection attacks), OutputGuard (output review and desensitization), SessionWatch (session-level behavior monitoring), Risk Score (signal integration for risk quantification), Dashboard (visual monitoring), and Data Exposure Mirror (privacy protection). All modules collaborate to form a unified security posture.

The tech stack uses Python 3.12 + FastAPI for the backend, React 18 + Vite for the frontend, and Tailwind CSS for the UI. The framework proactively aligns with industry standards: it uses the OWASP LLM Top10 (2025 edition) as the basis for risk classification, references NIST AI RMF and ISO/IEC 27001/42001, and also addresses Brazil’s LGPD compliance requirements.

While the framework is an academic prototype, it responds to industry needs and provides a methodology for structured thinking about LLM security. Upgrades from prototype to production are required: switching from rule-based detection to semantic classification, introducing persistent storage, establishing audit logs, conducting red team testing, etc. Its open-source nature provides a discussion foundation and practical cases for the AI security community.

The framework emphasizes that LLM applications need to build an additional protection layer at the application level, following the defense-in-depth concept. Future directions include semantic-level threat detection, real-time adversarial defense, cross-session anomaly analysis, etc. For LLM application teams, its risk classification and module design are worth referencing, and security should be a core architectural consideration.