Mitigating prompt injection attacks with a layered defense strategy

Google outlines a layered security strategy to mitigate indirect prompt injection threats in Gemini, combining model hardening and adversarial training with prompt injection content classifiers, security thought reinforcement, markdown sanitization and suspicious URL redaction, user-in-the-loop confirmations, and end-user security notifications. The approach is reinforced by red teaming, the Secure AI Framework (SAIF), BugSWAT events, the AI Vulnerability Reward Program (VRP), and industry collaboration via CoSAI to improve resilience across the prompt lifecycle.