Requirements for Policy Languages for Trust Negotiation

  • Authors:
  • K. Seamons;M. Winslett;T. Yu;B. Smith;E. Child;J. Jacobson;H. Mills;L. Yu

  • Affiliations:
  • -;-;-;-;-;-;-;-

  • Venue:
  • POLICY '02 Proceedings of the 3rd International Workshop on Policies for Distributed Systems and Networks (POLICY'02)
  • Year:
  • 2002

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Abstract

In open systems like the Internet, traditionalapproaches to security based on identity do not provide asolution to the problem of establishing trust betweenstrangers, because strangers do not share the samesecurity domain. A new approach to establishing trustbetween strangers is trust negotiation, the bilateralexchange of digital credentials describing attributes of thenegotiation participants. This approach relies on accesscontrol policies that govern access to protected resourcesby specifying credential combinations that must besubmitted to obtain authorization. In this paper wedescribe a model for trust negotiation, focusing on thecentral role of policies. We delineate requirements forpolicy languages and runtime systems for trustnegotiation, and evaluate four existing policy languagesfor trust management with respect to those requirements.We conclude with recommendations for extending existingpolicy languages or developing new policy languages tomake them suitable for use in future trust negotiationsystems.