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With the new application systems integrated with existing systems, many problems have arisen, such as system
integration difficultly and audit function loss. Hence, Single Sign-on has become an important solution for popular enterprise
business integration at present. According to the research and exploration of SSO system which is based on YaleCAS
authentication protocol, this paper introduced the integration of application systems using user-mapping with making
the least amount of modifications. In addition, this paper has provided a complete security audit function for the single
sign-on system, so a more comprehensive system security can be provided.