TL;DR
Technical guide demonstrates fine-grained access control for LLM retrieval systems using Google Zanzibar-inspired permission graphs.
Key Points
- SpiceDB implements ReBAC (Relationship-Based Access Control) for microsecond-latency authorization checks at scale
- Two filtering strategies: pre-filter (lookup authorized docs before retrieval) vs post-filter (check permissions after vector search)
- Production-tested by OpenAI securing 37 billion documents for 5 million ChatGPT Connector users
- Prevents information leakage in RAG pipelines by enforcing source system permissions on retrieved embeddings
Why It Matters
As RAG systems become critical infrastructure for LLM applications, permission enforcement directly impacts data security and compliance. This deep-dive provides engineers with concrete patterns for preventing unauthorized information disclosure—a top-10 LLM security risk per OWASP.
Source: www.pinecone.io