Researchers can now reverse-engineer LLM prompts from output text with near-perfect accuracy

Researchers at IIT Bombay and Adobe Research have built an inverse language model that reconstructs the original prompt from an LLM’s output with near-perfect accuracy. Their method, called “Previous-Token Prediction,” doesn’t need access to model weights and works across different models. For companies relying on proprietary system prompts, this could be a serious security risk.
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