Universal Access Control Security Architecture

Ubiquitous Computing is the integration of cyberspace and physical space.In this incorporated space,users can obtain digital services non-intrusively anytime and anywhere.As a new computing mode,Ubiquitous Computing has been considered as mainstream computing mode in the future by people.But there are some key issues that needed be settled in the application of Ubiquitous Computing.The security issue is one of these key issues.And the security issue has become a topic of discuss.Access Control is an important way to ensure information system,and it is also an effective way in the security control of system.So access control is also a way to solve security issues of Ubiquitous Computing.In the Ubiquitous Computing environment,as computing element is ubiquitous and mobile,and the cooperated principals is unpredictability,so it is unsuitable to use traditonal security mechanisms suited for static network or closed systems to solve problems occur in ubiquitous computing environment.The systems in ubiquitous computing need a distributed, dynamic,intelligent authorization managerment system.The thesis can be logically divided into four parts:study idea of the thesis,study on fuzzy access control model of ubiquitous computing,study on security issues in ubiquitous computing environment and study on security architecture of ubiquitous computing.The main work including:1.Analyzing the new security issues and the security issues's fuzzy characteristic of ubiquitous computing environment,proposing the necessity about introducing the fuzzy technology into ubiquitous computing access control system.2.Proposing a fuzzy access control model for ubiquitous computing,giving a reference monitor architecture.Using an instance validate,the model can reason form fuzzy context information.The model is fit for ubiquitous computing environment.3.Proposing a security access control system,giving architecture frame.The architecture has characteristic of distributed and dynamic,it can reason form fuzzy context information and fragmentary information,and it has multipolar security policy.The architecture can meet the need of security intension adaptability.4.Introducing the design and realizing of access control module,and giving the realizing of pivotal arithmetic.Introducing the fuzzy reasoning engine to access control module,realizing intelligent authorization decision-making,making access control system more intelligentize. The thesis has studied fuzzy security issues of ubiquitous computing environment,giving the ways to settle issues from academic model to architecture design.The thesis is worthy of further study in intelligent access control system of ubiquitous computing.