Building Trustworthy Semantic Webs Dr Bhavani Thuraisingham The University of Texas at Dallas Semantic web technologies for secure interoperability and digital libraries March 2010 Outline Secure Digital libraries and semantic web Secure heterogeneous federated data management and semantic web Secure web portals Secure Web data information management Secure data models Secure XML RDF Relational object oriented text images video etc Secure data management functions Secure query transactions storage metadata Key components for secure digital libraries and information retrieval browsing Secure Web Database Functions Secure Query Processing Secure Transaction Management Secure Storage Management Secure Web Data Security and Integrity Secure Metadata Management Management Secure Data Warehousing Secure Interoperability Secure Web Mining Secure Query Management Language Issues Query language to access the databases SQL extensions are being examined XML based query languages combined with SQL are emerging Example XML QL Querying RDF Data XML extensions for Multimedia databases such as SMIL Synchronized Multimedia Interface Language Mappings between multiple languages Web rules and query languages developed by W3C Security should be incorporated into all aspects Security Integrity Management Support for flexible security policies Negotiations between different database administrators Authorization and access control models such as role based access control Identification and authentication Privacy Control Copyright protection Plagiarism Maintaining the quality of the data coming from foreign sources Represent data and policies in XML RDF OWL and reason to determine quality and ensure security Secure Digital Libraries Digital libraries are e libraries Several communities have developed digital libraries Medical Social Library of Congress Components technologies Web data management Multimedia information retrieval indexing browsing Security has to be incorporated into all aspects Secure models for digital libraries secure functions Secure Information Retrieval Secure Query Processor Secure Metadata Manager Secure Update Processor Secure Browser Editor Secure Storage Manager Security Integrity Manager Secure Browsing Browser augments a multimedia system to develop a hypermedia system Search space consist of nodes and links with different access control rules and or classification levels May be represented as RDF Graphs Can a user traverse a link or access the contents of a node What authorization does he she have Interoperability of Heterogeneous Database Systems Database System A Database System B Relational Transparent access to heterogeneous databases both users and application programs Query Transaction processing ObjectOriented Network Database System C Legacy Technical Issues on the Interoperability of Heterogeneous Database Systems Heterogeneity with respect to data models schema query processing query languages transaction management semantics integrity and security policies Federated database management Collection of cooperating autonomous and possibly heterogeneous component database systems each belonging to one or more federations Interoperability based on client server architectures Federated Database Management Database System A Database System B Federation F1 Cooperating database systems yet maintaining some degree of autonomy Federation F2 Database System C Schema Integration and Transformation in a Federated Environment External Schema 1 1 External Schema 2 1 External Schema 1 2 Federated Schema for FDS 2 Federated Schema for FDS 1 Export Schema for Component A Generic Schema for Component A Component Schema for Component A External Schema 2 2 Export Schema I for Component B Export Schema II for Component B Export Schema for Component C Generic Schema for Component B Generic Schema for Component C Component Schema for Component B Component Schema for Component C Adapted from Sheth and Larson ACM Computing Surveys September 1990 Transforming Secure Data Models EMP Level Secret SS Ename Salary D 1 John 20K 10 2 Paul 30K 20 3 Mary 40K 20 Class EMP is Secret It has 3 instances John Paul and Mary DEPT Class DEPT is Unclassified Mgr Level It has 2 instances Math and Physics D Dname 10 Math Smith U Math is Unclassified 20 Physics Jones C Physics is Confidential Secure Schema Integration Security must be maintained during transformations Layer 5 Layer 4 Layer 3 Layer 2 Layer 1 External schemas Schemas for the various classes of users Federated schemas integrate export schemas of the components of the federation Export schemas for the components e g export schemas for components A B and C note component may export different schemas to different federations Generic schemas for the components e g generic schemas for components A B and C Secure Schemas at the Component level e g Component schemas for components A B and C Security Policy Integration Layer 5 Layer 4 Layer 3 Layer 2 Layer 1 External policies Policies for the various classes of users Federated policies integrate export policies of the components of the federation Export policies for the components e g export policies for components A B and C note component may export different policies to different federations Generic policies for the components e g generic policies for components A B and C Policies at the Component level e g Component policies for components A B and C Federated Data and Policy Management Data Policy for Federation Export Data Policy Export Data Policy Export Data Policy Component Data Policy for Agency A Component Data Policy for Agency C Component Data Policy for Agency B Inference Control Federated Inference Controller Federated Data Management Export Engine Inference Controller Component Data System for Agency A Export Engine Export Engine Inference Controller Inference Controller Component Data System For Agency C Component Data System for Agency B Applications of Semantic Web Technologies Specify generic policies and schema in RDF OWL Integrate the generic policies and schemas for federated policies and schemas Apply reasoning strategies for RDF and OWL for inference control in distributed environments What are web portals A portal or enterprise information portal EIP is a Web site that integrates an organization s knowledge base and all related applications into a single user customizable environment This environment acts as a one stop shop or gateway for users information and system needs An