There are different methods which you can use to improve the security of single sign on authentication. This type of authentication only requires a user name and password. One method involves using security questions, which only the user would know how to answer. However, if the user forgets their answers, they may not be able to sign on. Also, if questions are common information, it is possible other people could know the answers and gain unauthorized access.
Another Method to Improve Single Sign on Authentication Security
Another method to improve single sign on authentication security uses digital certificates. The digital certificates can be contained on the user’s computer, a smart card or USB token device. The user does not have to remember answers to security questions, but only select the appropriate digital certificate, when prompted for it. If the wrong certificate is selected, access is denied.