Using Claims Authentication with Sitefinity 5, you no longer "hit the wall" when integrating your site within a larger security context. Prior to version 5.x, Sitefinity used Forms Authentication for verification of user credentials to allow access to Sitefinity applications. Forms Authentication retrieved the user's name/password and checked it against data stored in the the database for that particular Sitefinity application. That works well enough for a single web site but comes up short in scenarios required by many organizations:

• "Single Sign On" (SSO) where you have several Sitefinity sites that should have only one login for the user. SSO allows you to show a ...