Norbert Gyorbiro

Privacy enhancing service architectures

Following from privacy requirements, new architecture solutions for personalized services are expected to emerge. This paper proposes a conceptual framework for designing privacy enabling service architectures, with a special emphasis on the mobile domain. The treatment of the subject is based on the principle of separating identity and profile information. Basic building blocks such as Identity Broker, Profile Broker, Contract Broker and Authenticator are identified and then put together in different ways resulting in variations on the architecture theme.

Mobile Data Replication Utilizing The Ternary Connectivity Model

In contrast to the mainstream approach where mobile devices have two states: connected or not-connected, we analyse mobile database replication in a setting with three states: good connection, reasonable connection and no connection. Using this as our starting point, we develop a new approach to data replication which is able to take advantage of the capabilities of the different connection alternatives. As a result of this approach, mobile devices can better utilize the available connection and are capable of optimizing for different goals such as availability and cost. Implementation details as well as experiences with a prototype implementation are also discus