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In this paper, the author has proposed noble method of the identity roaming to enable a user to sign up for one web site and extend the connectivity service in a location that is different from the home location where the user was registered and authenticated. The author has applied Assertions and Protocols for the OASIS Security Assertion Markup Language (SAML) V2.0 to provide the identity roaming service. The author have also devised the concept of Federation Bridge that interconnects distributed CoTs to minimize the trust relationship. We only need to deploy one federation bridge to connect all CoTs in the Web.