To put it in the simplest of terms, single sign on authentication or SSO is an authentication protocol that can be used to make it possible for an individual to sign into multiple applications located within the same server system using a single user name and password. Although this can certainly make things a lot easier, as it only requires a simple user name password combination to grant access, it is considered to be relatively insecure in the greater scheme of things.
Securing Single Sign On Authentication
Fortunately, there are a number of different ways to improve the security level of the single sign on authentication system available. The best way is to establish the need for a corresponding digital certificate requirement that can prevent outside or unauthorized computers and their users from being able to access the applications without having to undergo further authentication processes.