  Linked Data technologies become increasingly important in many domains. Key
factors for their breakthrough are security and trust, especially when sensible
or personal data are involved. Classical means for access control lack
granularity when parts of the Linked Data graph must be protected. The WebID,
combining semantic web concepts with methods from certificate based
authentication and authorization, seems promising to fulfill all requirements
concerning security and trust in the semantic web. In the context of the
PerSemID project, we challenged the WebID technology in a practical scenario
coming from the domain of lifelong learning and student mobility. In our use
case of study enrollment, we use WebIDs for authentication and to grant access
to parts of the triple stores of the different stakeholders. Cross domain
triple store interactions are used to exchange data between the involved
parties. Our fully implemented PoC exemplifies an application built on Linked
Data and WebID and allows us to judge the usability and security of WebID
technology in a real world scenario.
