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Lightweight Third-Party Authentication , is an authentication technology used in IBM WebSphere and Lotus Domino products. When accessing web servers that use the LTPA technology it is possible for a web user to re-use their login across physical servers.
A Lotus Domino server or an IBM WebSphere server that is configured to use the LTPA authentication will challenge the web user for a name and password. When the user has been authenticated, their browser will have received a session cookie - a cookie that is only available for one browsing session. This cookie contains the LTPA token.
If the user – after having received the LTPA token – accesses a server that is a member of the same authentication realm as the first server, and if the browsing session has not been terminated , then the user is automatically authenticated and will not be challenged for a name and password. Such an environment is also called a Single-Sign-On environment.