Cookie-based secure single sign-on method and unified authentication service system thereof

The invention discloses a Cookie single sign-on method, which comprises the following steps: a user sends a login request to a service server through a client browser; the service server is redirectedto a unified authentication service system according to the login request, and the unified authentication service system judges whether the service server carries a request certificate correspondingto the login request; the unified authentication service system writes the user credential into the Cookie and simultaneously splices the user credential to a redirected address; and the user credential is redirected to a user request page through the service server to execute the login request. The invention also discloses a unified authentication service system of the Cookie-based single sign-on, comprising a parameter analyzing module, an account checking module, a Cookie authentication module, a user credential generating module and a return module. The Cookie single sign-on method and theunified authentication ser