SSU: Extending SSH for Secure Root Administration

SSU, "Secure su," is a mechanism that uses SSH [Ylonen] to provide the security for distributing access to privileged operations. Its features include both shell or per-command access, a password for each user that is distinct from the login password and easily changed, and high portability. By installing SSU, administrators build a solid infrastructure for using SSH for improving security in other areas, such as file distribution and revision control.