Abstract
Identity management systems in Internet belong to different circles of trust and it is difficult to set up trust relationship among Identity Providers (IdPs) or Service Providers (SPs) which are located in different circles of trust. This paper proposes a distributed trust federation framework to solve the problem and its efficiency is analyzed with several experiments. It uses IdPs which belong to multiple Circles of Trust (CoTs) as relay entities to set up trust relationship among CoTs. The proposed framework is effective to extend the trust federation of identity management systems and thus improve easy of use for users in Internet..
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