Comment # 51 on bug 1175626 from Martin Wilck

(In reply to Martin Wilck from comment #48)

> The forced reinstall may have caused harm. When you reinstall (and the
> version number of the nvidia-gfxG05-kmp-default package is the same as
> before), the installation procedure will generate a new key with the same
> file name, overwriting the previous one. Because of rpm scriptlet ordering
> (%postun is executed after %post), this might lead to the old key remaining
> present and the new one not being enrolled.

Probably not, see bug 1176146.