9.4.4 Authentication token
As the name indicates the Authentication token contains the authentication information of the user. The Authentication Token serves the same function as the old Lightweight Third Party Authentication (LTPA) token in previous versions of WebSphere Application Server (prior to V5.1.1). The default authentication token is reserved for WebSphere Application Server runtime and is authentication mechanism specific. The Single Sign-On token is the new token format and the authentication token just serves the purpose of backward compatibility. Any modifications to this token by custom code can potentially cause interoperability problems.