Semantic Web Technology Ontological Security Studies

Semantic Web is the next generation network which was proposed by the founder of the World Wide Web Tim Berners-Lee, whose aim is to get the machine to understand Web page content and provide intelligent services for human being. After10years of development, the Semantic Web on basic theory and technology got rapid progress. However, with Semantic Web applications on the rise, it is increasingly highlighting the security challenges that it faces. In the open Internet environment, unauthorized access, malicious modification and improper use are the main method of network attacks, how to effectively protect data has become our urgent needs. At present, the Semantic Web security research has lagged far behind in the metadata descriptions and data interoperability development, the industry consensus agree that security is the key issue must be solved before Semantic Web becomes the mainstream technology.Since ontology is the core technology to construct Semantic Web, the dissertation mainly targets at the existing weak links of ontology security; some of the key areas and application technology are thoroughly studied. The content of the research work mainly involves access control, integrity protection, ontology availability and other aspects of the problem. The innovative results achieved are as follows:●According to the fact that explicit expression of RBAC strategy is vulnerable, active digital watermarking technology is introduced into the research of access control to the ontology. On the basis of syntax analysis of OWL document structure, several text information hiding method based on the OWL language are proposed to build active watermark based authorization Ontology model using RBAC and related algorithms.●In the open. distributed Internet environment, traditional identity-based security mechanisms cannot fit the application of Semantic Web. Therefore, on the basis of ABAC model formalization. ontology ABAC security model is constructed, programming with easier for users to understand and implement N3Logic to describe rules in the model, using the reasoning ability of Semantic Web to provide proof of access control based on ontology, which greatly improve the safety of the system.●Concerning the problem that modification of sensitive data in ontologies is difficult to be detected and discovered after being illegal tampered, zero-watermarking and information hiding technology are brought into the research of ontology integrity. Ontology data integrity verification model and related algorithms are designed with JAVA programming to verify the soundness of the method.●The universal existence of Ontology heterogeneous has become the major obstacles of ontology interoperability and semantic communication, causing a serious security threat to the normal usage of ontology. Paper thoroughly analyzed the essence of semantic heterogeneity in the ontology heterogeneity, and proposed semantic heterogeneity digestion method based on fuzzy logic. Digestion by constructing a fuzzy public ontology to solve the problem of semantic heterogeneity, which provides a new way of thinking to increase the availability of ontology.Research findings enrich the digital watermark, N3Logic, zero-watermark, fuzzy logic in the field of Semantic Web security application. A number of certain theoretical and practical values of research results are obtained which has laid the foundation of theory and methods to solve the security problems that the Semantic Web in practice faced.The results of this dissertation may have certain value in the applation area of Internet environment for ontology access control, confidential information transmission, integrity testing, information systems integration, e-government and e-commerce and other fields.