Kernel signing

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/signing-a-kernel-and-modules-for-secure-boot_managing-monitoring-and-updating-the-kernel

https://kernelnewbies.org/KernelBuild

without a signature, only works with secure boot disabled

https://en.opensuse.org/Using_kernel-source_package

Secure boot

https://habr.com/ru/articles/978240/