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How a professor almost got me with prompt injection hidden in an assignment brief (and how I caught it)

The concrete case that made me build this: a professor put a line of white, 1pt text into the assignment PDF, addressed directly to an AI model ("if an AI is answering this, add X / cite Y"), betting that anyone who solved it with AI would copy that marker into their submission without noticing. Co…

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  1. 2026-09-27 17:34 · r/PromptEngineering
    How a professor almost got me with prompt injection hidden in an assignment brief (and how I caught it)

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