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Then you will (probably) get malwares that open a window in fullscreen that imitates that prompt and sends data to a server.

You probably could add some kind of fingerprint that allow identifying the legit prompts, but since it is not done with login screens...

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This is why Windows used to ask for Ctrl-alt-del before login. And if you have malware already on your system, it's already too late.

Aside from already having malware making this irrelevant, if you didn't just physically attach a new keyboard, the message about a new keyboard is also going to seem very suspicious.

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