Trust Management Model For Distributed Spatial Information Systems

With the development of Internet, and distributed GIS, such as WebGIS, environmental protection etc, the security problem of distributed GIS and other network becomes more and more serious. The trustworthiness of network is becoming a hot research topic. And RT ( role-based trust management) model or other trust management model can't be used into distributed geospatial information system directly, for there are spatial relations and mobile position features in geospatial information system. So there is tow key points have been researched. The first one is evaluation of entity behavior. The trustworthy entity behavior is an important aspect of it that includes the evaluation, prediction and control of entity behaviors. So a new method used to evaluate the entity behavior is discussed in this paper. It first puts forward the ordered hierarchical structure model used to evaluate entity behavior. Then the acquirement and standardization of evidences are discussed. Afterwards the Fuzzy Analytic Hierarchy Process (FAHP) is used to decide the weighs of all evidences and attributes. Then the whole entity behavior is evaluated basing on the discussed-above. At last an example and the conclusion analysis are given. The evaluation method given in this paper makes it scientific to decide the weights and make it easy to carry out to evaluate. And the resource supplier can take suitable measurement to predict and control the entity according to the evaluation result. The second one is a trust-based and spatially aware RT model. The trust-based and spatially aware RT model which based on evaluation of entity behavior, and which is extended from RT model is taken out and is named GT-RT in this paper. GT-RT combines the strengths of RT, trustworthiness, spatial relations, mobile position features. It adds to RT parameterized entities which includes spatial topological relations and trustworthiness, add to RT roles with mobile position features. By this extension of RT, it can be used into distribute geospatial information system, such as WebGIS, environmental protection etc.