Abstract
Heterogeneity of information sources in a cooperative information system reveals problems linked with the homogenization of the local security policies. Thus, two kinds of heterogeneity are distinguished: heterogeneity of the local access security policies and semantic heterogeneity among instances of local sources related to objects/subjects (users). Using an extended role-based model, we consider not only the access security to information but also the organizational security not tackled in most research projects. The ACSIS project proposes an hybrid mediation-based architecture gathering object and agent paradigms.
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