Svetlana Boudko

• PhD
• Senior Researcher at Norwegian Computing Center

The proliferation of healthcare data has expanded opportunities for collaborative research, yet stringent privacy regulations hinder pooling sensitive patient records. We propose a \emph{multiparty homomorphic encryption-based} framework for \emph{privacy-preserving federated Kaplan--Meier survival analysis}, offering native floating-point support,...

Distributed analytics, such as federated learning, involve collaborative computation across multiple decentralized devices. This approach not only reduces data transfer costs but also offers some degree of protection for privacy-sensitive information. To achieve a higher level of privacy protection, it is recommended to use more advanced privacy-pr...

Methods for untraceable and anonymous communication, such as anonymous routing networks and dining cryptographers networks, are in general very complex and suffer from high performance overhead of a minimum order of \(N^2\) encryptions for N participants. In this paper, we propose an original approach to untraceable communication that avoids some o...

Healthcare 4.0 is a new paradigm for providing healthcare services in highly distributed and complex settings. The distributed and heterogeneous nature of home-based medical devices, and their need to exchange data with external sources make Healthcare 4.0 solutions susceptible to cyberattacks and require decentralized solutions to protect sensitiv...

The healthcare market demands flexible, and secure solutions for personal health data sharing. For this purpose, we developed a distributed multi-agent system that reinforces a negotiable right management environment. We propose a bilateral bargaining mechanism that facilitates computational negotiation between patients and healthcare stakeholders....

We applied evolutionary game theory to extend a resource constrained security game model for confidentiality attacks and defenses in an Advanced Metering Infrastructure (AMI), which is a component of IoT-enabled Smart Grids. The AMI is modeled as a tree structure where each node aggregates the information of its children before encrypting it and pa...

We applied evolutionary game theory to extend a resource constrained security game model for confidentiality attacks in an Advanced Metering Infrastructure (AMI), which is a component of IoT-enabled Smart Grids. The AMI is modelled as a tree structure where each node aggregates the information of its children before encrypting it and passing it on...

Sammendrag Historisk befolkningsregister, HBR, er et register over den norske befolkningen fra 1801 frem til Det sentrale folkeregisteret fra 1964. Det lages ved å lenke sammen personforekomster av samme person i folketellinger og kirkebøker og koble sammen nære familiemedlemmer. Vi viser hvordan algoritmer brukes til å finne lenker og koblinger....

The healthcare market demands advanced, flexible, and secure solutions for personal health data sharing. In our paper, we present preliminary work that proposes a distributed infrastructure of negotiating agents for the healthcare domain. This infrastructure will support healthcare stakeholders to share and access patient health data in a secure wa...

Smart grids are complex cyber-physical systems that face many security challenges. Advanced Metering Infrastructure (AMI), which is one of the main components of the smart grid, represents an important branch of services with increasing deployments that also introduce new security risks. The nodes of AMIs are featured as resource-constrained. There...

This article describes the development of the Norwegian Historical Population Register, which is the first open national register. In the period 1735-1964, 9.7 million people lived in Norway, and for them 37.5 million events (such as birth, death, or migration) have been recorded in sources. We link together as many events as possible for the same...

The healthcare market demands more advanced and flexible solutions to provide better care for patients. Moving medical services closer to patients improves the quality of healthcare but brings, at the same time, new challenges. It requires a well-functioning, decentralized infrastructure and better workflow support for health personnel. Therefore,...

Mobile devices are typically equipped with multiple access network interfaces, supporting the coexistence of heterogeneous wireless access networks. The selection of an optimal set of multiple serving mobile networks for multicast streams is NP-hard and is, therefore, a challenging problem. We propose and evaluate a simple heuristic algorithm that...

Purpose – Coexistence of various wireless access networks and the ability of mobile terminals to switch between them make an optimal selection of serving networks for multicast groups a challenging problem. Since optimal network selection requires large dimensions of data to be collected from several network locations and sent between several netwo...

The increasing demand for real-time multimedia streaming from mobile users makes important deployment of network selection in wireless networks. Coexistence of various wireless access networks and ability of mobile terminals to switch between them make an optimal selection of serving mobile networks for groups of mobile clients a challenging proble...

Coexistence of various wireless access networks and the ability of mobile terminals to switch between them make an optimal selection of serving networks for multicast groups a challenging problem. Since optimal network selection requires large dimensions of data to be collected from several network locations and sent between several network compo...

We consider a network selection problem for a group of mobile clients that operate in a heterogeneous wireless access network environment and are equipped with multiple access network interfaces. The involved networks cooperate in order to improve their own and the mobile clients’ performance. We formulate the problem as a team decision problem. In...

We develop and evaluate a rate-allocation multipath algorithm for delivery of video in a Video-on-Demand (VoD) system built upon an overlay network. To evaluate how well the rate-allocation algorithms approach the optimum, we have earlier built a benchmarking system that provides the optimal solution for assigning available bandwidth to delivery pa...

A streaming system that uses an overlay network for multipath streaming needs to make decisions concerning the distribution of the available bandwidth among all of its clients. This decision making should aim at delivering the best possible quality to all clients while providing an optimal utilization of the network resources. We consider a scenari...

Concerning video transmission on the Internet, we present a model for estimating the subjective quality from objective measurements at the transmission receivers and on the network. The model reflects the quality degradation subject to parameters like packet loss ratio and bit rate, and is calibrated using the prerecorded results from subjective qu...

Concerning video transmission on the Internet, we present a model for estimating the subjective quality from objective measurements at the transmission receivers and on the network. The model reflects the quality degradation subject to parameters like packet loss ratio and bit rate and is calibrated using the results from subjective quality assessm...

We describe the ADIMUS architecture which addresses the problem of maintaining the subjective quality of multimedia streaming for a mobile user. In contrast to other works, the entire end-to-end path of the video stream is considered. Adaptation mechanisms for maintaining quality include time-critical handovers, overlay routing and network estimati...

The rapid growth of the Internet multimedia services brings new challenges to how multimedia streams can be delivered to the users over bandwidth-constraint networks. Different strategies that exploit multipath streaming in order to provide better utilization of the Internet resources have been proposed by the research community. However, there exi...

Using a Petri net engine to manage workflow processes requires additional interfacing software to connect the Petri net to the real world. Furthermore, changes in the real world or in the process model must often be reflected in the interfacing software, thus creating a potential consistency problem. We present a Petri net-based software architectu...

NR researchers have looked into the possibilities for digital and interactive TV. Digital TV will give advantages for all involved parties, but results also in technical challenges. Issues like interactivity, return channel, new programme formats, etc. are discussed. There will also be integration between broadcasting and Internet technology, with...