Single sign on authentication is where a person will enter a single user name and password and will not be required to enter it again for access to different resources and applications. The process for authentication is conducted in the background, as each application or resource is opened. It does have its advantages, as well as disadvantages, which are easy to counter.
Disadvantages to Single Sign on Authentication Can Be Countered
There are ways in which you can use single sign on authentication while not worrying about security issues. The most popular methods are to use smart cards or USB token devices, which provide two factor authentication. At the initial sign in process, after entering in your user name and password, the authentication process with ask for the USB token or smart card device. After it is inserted into the computer, it will use this device for further authentication as each resource and application is opened, without asking the user to re-enter their information.