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Types of Prompt Injection
Direct injection embeds malicious instructions in user prompts. Indirect injection hides instructions in documents or web pages the AI reads. Jailbreaking manipulates the AI into ignoring safety training. Each requires different defense strategies.
Detection Methods
Rule-based detection identifies known attack patterns. Semantic analysis detects intent-level manipulation. Input/output consistency checking verifies responses match expected behavior. Multi-stage verification uses separate AI models to validate primary model outputs.
Defense in Depth
No single defense is sufficient. Layer multiple protections: input sanitization, system prompt hardening, output verification, anomaly detection, and user behavior monitoring. The dual-layer guardrail approach provides comprehensive protection.
Enterprise Best Practices
Log all detected injection attempts, alert security teams on patterns, maintain an evolving rule set, conduct regular red teaming, and use guardrail platforms that update their detection models continuously.