Information
The login window prompts a user for his/her credentials, verifies their authorization level and then allows or denies the user access to the system.
Rationale:
Prompting the user to enter both their username and password makes it twice as hard for unauthorized users to gain access to the system since they must discover two attributes.
Solution
Perform the following to ensure the login window display name and password:
Graphical Method:
Open System Preferences
Select Users and Groups
Select Login Options
Set Name and Password
Terminal Method:
Run the following command to enable the login window to display name and password:
$ sudo defaults write /Library/Preferences/com.apple.loginwindow SHOWFULLNAME -bool true
Note: The GUI will not display the updated setting until the current user(s) logs out