Trust Relationship Establishment Based on the Existing Trust

Identity management (IdM) is a fundamental technology for various services on Internet. In order to benefit aggregation of various service, it is necessary to establish trust relationship between Identity providers (IdPs) in different cycle of relationship between visited IdP and home IdP, but also designs an effective authentication model that can fully use existing interface without additional negotiation processes. These proposals can improve interoperability of IdM and can evidently benefit the development of Internet services.