Έμπιστο περιβάλλον συνεργασίας και παροχής ασφαλών, ιδιωτικών και διαλειτουργικών υπηρεσιών

Πενταφρόνιμος, Γεώργιος Κ.

Doctoral Thesis

Author

Πενταφρόνιμος, Γεώργιος Κ.

Date

2013-03-19

Abstract

With the advent of Web 2.0 applications and social networks, modern services are able to offer advanced capabilities to end-users enabling their active participation in collaborative environments and the exchange of personal knowledge and experiences. However, new privacy threats have also appeared. Apart from the technological challenges that need to be addressed for the effective integration of Web 2.0 technologies in trusted Information Systems and service frameworks, the research results of this thesis also identify the need for the protection of privacy with regards to the interactive capabilities offered for publishing personal content and participating in social interactions. Having as its main goal the introduction of innovative solutions for privacy protection in collaborative workspaces, this thesis primarily specifies the architecture of a Trusted Collaborative Information System (TCIS) that is capable of satisfying modern requirements for the provision of secure, privacy-aware and interoperable services. The second contribution comprises the risk assessment of all critical, in terms of privacy protection, systems integrated within the architecture of TCIS. Also, open issues that are not covered in the literature are identified, which are mostly related to the "loosely" controlled use of the interactive services and capabilities that Web 2.0 applications offer to end-users. The third and fourth contribution of this thesis focus on effectively addressing the open issues identified and constitutes the main innovations for the protection of privacy in collaborative environments. On one hand, these comprise an innovative identity management architecture where the reputation of users is handled as an identity attribute capable of effectively substituting their role for the provision of access privileges to Web 2.0-based services. On the other hand, in order to enable collaborative privacy protection and the enforcement of trusted authorization decisions, a recursive method for computing reputation scores is also specified, which, apart from the privacy-pervasive reports, also takes into consideration other critical factors of the collaborative environment. The fifth and final contribution of the thesis has as its main goal to highlight the benefits of the adoption of TCIS in critical domains of modern Information Society, as for example the e-Government domain, through demonstrating its applicability for the provision of secure, privacy-aware and interoperable services to legal immigrants (e-Migration services).