The type of authentication most people are familiar with is single sign on authentication. This type of authentication requires you to enter a user name and password when logging onto a computer. You may also be required to enter your user name and password every time you start a software application, connect to network resources, connect to the internet, or use a virtual private network.
Users May Use the Same User Name and Password with Single Sign on Authentication
One issue organizations can face, when using single sign on authentication is employees, who use the same user name and password for everything. Some employees may even write their user name and password down on a piece of paper and place it on their computer monitor, in their desk drawer or under their keyboard. When they do this, anyone can log into the computer and gain access to resources.