An example device includes one or more memories; and one or more processors, communicatively coupled to the one or more memories, to, during a loading process of a boot process of an operating system, identify a file to be loaded for the operating system, where the operating system is being loaded during the boot process; identify a manifest of the file; verify the manifest of the file based on a supplied signature of the manifest; identify a fingerprint, associated with the file, in a fingerprint library; calculate a hash of the file; compare the hash of the file and the fingerprint; and verify the file based on the hash of the file matching the fingerprint associated with the file.