what is the administrator equivalent account in linux called
Superuser In Unix-like computer OSes, root is the conventional name of the user who has all rights or permissions (to all files and programs) in all modes (single- or multi-user). Alternative names include baron in BeOS and avatar on some Unix variants.[2] BSD often provides a toor ("root" written backward) account in addition to a root account.[3] Regardless of the name, the superuser always has a user ID of 0. The root user can do many things an ordinary user cannot, such as changing the ownership of files and binding to network ports numbered below 1024.
Public key infrastructure The PKI role that assures valid and correct registration is called a registration authority (RA). An RA is responsible for accepting requests for digital certificates and authenticating the entity making the request.[2] In a Microsoft PKI, a registration authority is usually called a subordinate CA.[3]