PuzzleMask: A Covert #AI Attack Vector #CheckPoint Research has detailed #PuzzleMask, a plain-prose prompt technique that hides prohibited instructions from lightweight LLM gatekeepers while allowing stronger target models to recover them. In testing, gatekeepers classified the prompts as safe, while target models extracted and acted on concealed payloads in more than 90 percent of trials. https://research.checkpoint.com/2026/puzzlemask-abusing-plain-prose-as-a-covert-ai-attack-vector/ #CheckPointSoftwareTechnologies