The security administrator

A security administrator is responsible for securing the overall system including access control strategies and firewalls.

Implementing the security plan outlined in the security architecture document:
The security administrator is responsible for deploying the security features and processes outlined in the security architecture document developed by the security architect.
Managing the user registry:
The security administrator maintains the security registry by running various update delete tasks.
Managing users and groups:
The security administrator maintains the users and groups stored in the user registry.
Managing access control
The security administrator manages access controls to pages, portlets, modules, and other applications.
Additional security tasks
There are various other tasks carried out by the security administrator depending on what environment is being used.