As the application of digital signature is progressed in real life, the situation of using digital signatures tends to become more complex. Depending on applications a user may need to generate multiple signatures for the same message with his multiple signing keys. But the general approach of generating multiple independent signatures is not efficient. To solve this problem, we propose multi-k...

Capture and access applications automate the capture of and the access to live experiences and are a main theme in the ubiquitous computing research area. Examples of such applications have been built in the educational, office and meeting domains, and most of them make extensive use of network communication, multimedia streaming and storage systems. Despite their common needs and architectural...

The Linked Open Data University of Münster (LODUM) project establishes a university-wide infrastructure to publish university data as Linked Open Data. The main goals are to increase visibility and accessibility of data produced and collected at the university, and to facilitate effective reuse of these data. This includes the goal to ease the development of applications and mashups based on th...

The proliferation of smart phones and tablets have fuelled a new wave of demand for mobile services. Today's users not only expect ubiquitous network connections, but also seek a rich media experience wherever they go and whenever they need. The thrive of mobile media gives rise to a multi-fold of technical challenges. It is hard to sustain satisfactory quality of experience over inherently unr...

Secure group communication protocols, in particular multi-party key agreement and update algorithms, help promote traditional and new Internet multi-party applications such as video conferencing or distance education. We propose a framework for marrying such approaches with access management mechanisms and applications in real environments. Furthermore, we extend this framework with anonymisati...

Next generation systems for critical infrastructure protection must support capabilities such as behavior analysis, situation modeling and data mining integrated within sophisticated virtual or augmented reality interfaces. This paper describes the design goals and implementation of a platform for critical infrastructure security applications. The platform is designed to support semi-automated ...

Norway is a country with large geographical dimensions and a very low number of inhabitants. This combination makes advanced telecommunication services and distributed multimedia applications, like telemedicine and distance education, very important for the Norwegian society. Obviously, an appropriate networking infrastructure is necessary to enable such services and applications. In order to c...

The MultiMedia Multi-Channel Infrastructure shall enable the development of multimedia services which can be deployed across multiple devices. The platform functions as a springboard for the prototyping of new products and services relevant to both industrial and public sectors. The infrastructure consists of all generic mechanisms needed by di erent applications. This makes the development of ...

This paper focuses on services and applications provided to mobile users using airborne computing infrastructure. We present concepts such as drones-as-a-service and flyin,fly-out infrastructure, and note data management and system design issues that arise in these scenarios. Issues of Big Data arising from such applications, optimising the configuration of airborne and ground infrastructure to...