Costas Kalogiros

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Over the past decades, the fundamental principles of the Internet architecture have not significantly changed. However, Internet evolution and its effects on participants' interests have triggered the need for redefining these design principles. " Design for Tussle " is an aspiration for future network designs , which enables the involved stakeholders to(More)
With evolution of the Internet from a controlled research network to a worldwide social and economic platform, the initial assumptions regarding stakeholder cooperative behaviour are no longer valid. Conflicts have emerged in situations where there are opposing interests. Previous work in the literature has termed these conflicts tussles. This article(More)
Current Future Internet (FI) research brings out the trend of designing information-oriented networks, in contrast to the current host-centric Internet. Information-centric Networking (ICN) focuses on finding and transmitting information to end-users, instead of connecting end hosts that exchange data. The key concepts of ICN are expected to have(More)
The analysis of existing software evaluation techniques reveals the need for evidence-based evaluation of systems' trustworthiness. This paper aims at evaluating trustworthiness of socio-technical systems during design-time. Our approach combines two existing evaluation techniques: a computational approach and a risk management approach. The risk-based(More)
Trustworthiness of dynamical and distributed socio-technical systems is a key factor for the success and wide adoption of these systems in digital businesses. Different trustworthiness attributes should be identified and accounted for when such systems are built, and in order to maintain their overall trustworthiness they should be monitored during(More)
—We evaluate from a VoIP provider's point of view possible strategies for selecting PSTN gateways and/or signaling servers (perhaps through ENUM) under blocking uncertainty. Different gateways may have different prices for terminating the VoIP calls to the PSTN and different blocking probabilities. A customer placing a call to the VoIP provider is impatient(More)
We propose WOICE (Wireless vOICE), a fully distributed architecture capable of supporting and offering ubiquitous voice services over wireless IP-based data networks. Existing WiFi infrastructure-deployed by enterprises or even individuals-will be supplemented with software modules based on open standards in order to support VoIP. Furthermore , a new breed(More)
This paper aims to unravel the intricacies of the mechanisms of trust vis-à-vis ICTs and the contextual logic guiding user deployment and experience , necessitating a view of trust in the digital realm as a dynamic process. Trust models tend to highlight 'well-placed trust' in their focus on drawing out (sub)components of (perceived) trustworthiness as(More)