Identity management platform, service server, login system and method, and federation method

The present invention relates to an identity management platform, business servers, joint approach to establish identity, unified login system and method. The identity management platform includes an information receiving module, co-management module, message sending module; the service server includes an information receiving module, log management module, message sending module; the unified login system, including identity management platform, business server and identity federation database; identity federation and user logon method by joint identity information in the identity management platform and server business, to achieve a unified login. Without the user when the present invention enables the user to establish identity in the joint information, for business visit again tedious authentication process, reducing the cumbersome operation of subscriber service access; and to ensure the security of important information such as user identity information, reliability .