Defense Strategies: Layered Validation, NeMo Guardrails, and Constitutional AI
~13 min read
No single defense stops every attack — real safety comes from layering input validation, output validation, dedicated guardrail frameworks like NeMo Guardrails, and training-time approaches like Constitutional AI.
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Key points
- •No single defense is sufficient — real production safety comes from defense in depth: multiple independent layers, each catching what the others miss
- •Input validation catches known attack patterns before generation; output validation (content filtering, toxicity, PII redaction) catches what slips through afterward
- •NeMo Guardrails implements this as configurable 'rails' — input rails, dialog rails (constraining allowed topics/flows), and output rails — defined declaratively via Colang
- •Constitutional AI builds safety into TRAINING itself: the model critiques and revises its own drafts against written principles, generating its own training signal
- •The practical stack: training-time approaches (Constitutional AI) shape default behavior, input rails catch known attacks, output rails catch whatever gets through both