BIB-VERSION:: CS-TR-v2.0
          ID:: STAN//CS-TN-97-53
       ENTRY:: February 05, 1997
ORGANIZATION:: Stanford University, Department of Computer Science
       TITLE:: A Communication Agreement Framework of Access Control
        TYPE:: Technical Note
      AUTHOR:: Roscheisen, Martin
      AUTHOR:: Winograd, Terry
        DATE:: February 1997
       PAGES:: 11
    ABSTRACT:: We introduce a framework of access control which shifts the
               emphasis from the participants to their relationship. The
               framework is based on a communication model in which
               participants negotiate the mutually agreed-upon boundary
               conditions of their relationship in compact "communication
               pacts," called "commpacts." Commpacts can be seen as a third
               fundamental type next to access-control lists (ACLs) and
               capabilities. We argue that in current networked environments
               characterized by multiple authorities and "trusted proxies,"
               this model provides an encapsulation for interdependent
               authorization policies, which reduces the negotiation
               complexity of general (user- and content-dependent)
               distributed access control and provides a clear
               user-conceptual metaphor; it also generalizes work in
               electronic contracting and embeds naturally into the existing
               legal and institutional infrastructure. The framework is
               intended to provide a language enabling a social mechanism of
               coordinated expectation.
       NOTES:: [Adminitrivia V1/Prg/19970205]
         END:: STAN//CS-TN-97-53