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Research On Cooperative Work And Security Mechanism Of Web Grading

Posted on:2005-09-20Degree:MasterType:Thesis
Country:ChinaCandidate:C LiuFull Text:PDF
GTID:2168360152469131Subject:Computer system architecture
Abstract/Summary:PDF Full Text Request
Web grading is a kind of application system to improve automation, intelligence and sharing level of grading. As a CSCW system working under distributed mode, how to build a cooperative working environment, protecting sharing resources, guarantee safe transmission among members and distinguish member identification has very deep meaning in today's society.RBAC is an advanced access control policy. It is able to restrict users' access to key resources according to role of the user and alleviate the burden of authorization management. Identification recognition, authentication and digital signature are strong methods of available security theories to secure safe transmission in network environment.On the basis of RBAC theory and safe communication theory, a cooperation-based web grading (CBWG) model is presented. Composing element, composing mode and cooperative working policy of CBWG are described and concepts such as cooperative activity, activity template and activity tree are introduced. The interactive relation between roles and shared objects among cooperative activities is described by means of activity template, thus the characteristic and behavior of a cooperative activity can be reflected. A distributed secure access control policy is maintained by entity represented by different nodes in the activity tree.With the help of user, role and shared object from RBAC model, protection for integrality and secrecy of shared data in web grading system is implemented. On the basis of secure communication theory available, identification recognition and authentication of members and digital signature are introduced that will guarantee secure communication among members in role groups. Based on CSCW system, the CBWG model built up by RBAC theory and secure communication is able to satisfy practical requirement and has good expansibility.
Keywords/Search Tags:Web Grading System, Computer Supported Cooperative Work, Role-Based Access Control, Activity Template, Activity Tree, Safe Communication
PDF Full Text Request
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