The authentication process has two main steps:
1. Identification. In this step, users enter their identification into the system for it to identify the user. This can take the form of a username and password, for example.
2. Central authentication. During this step, the user enters a credential that only the authenticated user should know or be able to present. This might take the form of a biometric marker, for example. This second piece of information enables the system to authenticate the identity of the person who is trying to gain access to the system.