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What is system-prompt leaking / prompt extraction, and how do you defend against it?

Attackers coax models into spilling the hidden system prompt, exposing IP, business logic, or worse, embedded secrets. The signal is treating the prompt as non-secret and defending in layers, rather than betting on 'never reveal your instructions.'

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.

Attackers coax models into spilling the hidden system prompt, exposing IP, business logic, or worse, embedded secrets. The signal is treating the prompt as non-secret and defending in layers, rather than betting on 'never reveal your instructions.'

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