Kerberos is a server of secured user names and passwords (named after the three-headed monster in Greek mythology that guarded the gate of hell). The importance of Kerberos is that provides one centralized security server for all data and resources on the network. Database access, login, authorization control, and other security features are centralized on trusted Kerberos servers. Kerberos has a similar function to that of certificate server; to identify and validate user. Security companies are currently investigating a merger of Kerberos and certificate servers to provide a network-wide secure system.