The PGP file signatures linked in /wiki/Verify_the_virtual_machine_images_using_Linux do not exist. I have provided the specific links I’m referring to below:
/libvirt/17.0.4.5/Whonix-Xfce-17.0.4.5.libvirt.xz.asc
/ova/17.0.4.5/Whonix-Xfce-17.0.4.5.ova.asc