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An access control model called Zero Trust Architecture (ZTA) has attractedattention. ZTA uses information of users and devices, called context, forauthentication and authorization. Zero Trust Federation (ZTF) has been proposedas a framework for extending an idea of identity federation to support ZTA. ZTFdefines CAP as the entity that collects context and provides it to eachorganization (Relying Party; RP) that needs context for authorization based onZTA. To improve the quality of authorization, CAPs need to collect context fromvarious data sources. However, ZTF did not provide a method for collectingcontext from data sources other than RP. In this research, as a general modelfor collecting context in ZTF, we propose a method of linking identifiersbetween the data source and CAP. This method provides a way to collect contextfrom some of such data sources in ZTF. Then, we implemented our method usingRADIUS and MDM as data sources and confirmed that their contexts could becollected and used.

Linking Contexts from Distinct Data Sources in Zero Trust Federation