where do i find Nvidia kernel module keys?

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The easy method to install NVidia drivers is to use the rpmfusion repository. Fedora won't boot or the graphics aren't working? Here's the instructions on how to sign a kernel module. The information starts about half way down the page. I have successfully done this in the past for an out-of-tree kernel module. And yes, you use openssl to generate the keys.

I'm surprised that Windows 10 won't boot with secure boot enabled. But the resolution problem suggests that you might not have the right driver for your graphics.