P. Andriotis, G. Oikonomou, T. Tryfonas, S. Li, "Highlighting Relationships of a Smartphone’s Social Ecosystem in Potentially Large Investigations", IEEE Transactions on Cybernetics, IEEE, 46(9), pp. 1974-1985, 2016
Social media networks are becoming increasingly popular because they can satisfy diverse needs of individuals (both personal and professional). Modern mobile devices are empowered with increased capabilities, taking advantage of the technological progress that makes them smarter than their predecessors. Thus, a smartphone user is not only the phone owner, but also an entity that may have different facets and roles in various social media networks. We believe that these roles can be aggregated in a single social ecosystem, which can be derived by the smartphone. In this paper, we present our concept of the social ecosystem in contemporary devices and we attempt to distinguish the different communities that occur from the integration of social networking in our lives. In addition, we propose techniques to highlight major actors within the ecosystem. Moreover, we demonstrate our suggested visualization scheme, which illustrates the linking of entities that live in separate communities using data taken from the smartphone. Finally, we extend our concept to include various parallel ecosystems during potentially large investigations and we link influential entities in a vertical fashion. We particularly examine cases where data aggregation is performed by specific applications, producing volumes of textual data that can be analyzed with text mining methods. Our analysis demonstrates the risks of the rising ``bring your own device'' trend in enterprise environments.
T. Spyridopoulos, K. Maraslis, T. Tryfonas, G. Oikonomou, S. Li, "Managing Cyber Security Risks in Industrial Control Systems with Game Theory and Viable System Modelling", in Proc. 9th IEEE International System of Systems Engineering Conference (SOSE 2014), 2014
Cyber security risk management in Industrial Control Systems has been a challenging problem for both practitioners and the research community. Their proprietary nature along with the complexity of those systems renders traditional approaches rather insufficient and creating the need for the adoption of a holistic point of view. This paper draws upon the principles of the Viable System Model and Game Theory in order to present a novel systemic approach towards cyber security management in this field, taking into account the complex inter-dependencies and providing cost-efficient defence solutions.
S. Li, G. Oikonomou, T. Tryfonas, T. Chen, L. Xu, "A distributed consensus algorithm for decision-making in service-oriented Internet of Things", Transactions on Industrial Informatics, IEEE, 10(2), pp. 1461-1468, 2014
In a service-oriented Internet of Things (IoT) deployment, it is difficult to make consensus decisions for services at different IoT edge nodes, where available information might be insufficient or overloaded. Existing statistical methods attempt to resolve the inconsistency, which requires adequate information to make decisions. Distributed Consensus Decision Making (CDM) methods can provide an efficient and reliable means of synthesizing information by using a wider range of information than existing statistical methods. In this paper, we firstly discuss service composition for the IoT, by minimizing the multi-parameter dependent matching value. Subsequently, a cluster-based distributed algorithm is proposed, whereby consensuses are first calculated locally and subsequently combined in an iterative fashion to reach global consensus. The distributed consensus method improves the robustness and trustiness of the decision process.
P. Andriotis, T. Tryfonas, G. Oikonomou, S. Li, Z. Tzermias, K. Xynos, H. Read, V. Prevelakis, "On the Development of Automated Forensic Analysis Methods for Mobile Devices", in Proc. 7th International Conference on Trust & Trustworthy Computing (TRUST 2014), ser. Lecture Notes in Computer Science, 8564, pp. 212-213, 2014
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