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Auflistung nach Autor:in "Fidas, Christos"

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  • Zeitschriftenartikel
    CogniPGA: Longitudinal Evaluation of Picture Gesture Authentication with Cognition-Based Intervention
    (i-com: Vol. 18, No. 3, 2019) Katsini, Christina; Avouris, Nikolaos; Fidas, Christos
    There is evidence that the visual behavior of users when creating graphical passwords affects the password strength. Adopting a cognitive style perspective in the interpretation of the results of recent studies revealed that users, depending on their cognitive style, follow different visual exploration paths when creating graphical passwords which affected the password strength. To take advantage of the inherent abilities of people, we proposed CogniPGA, a cued-recall graphical authentication scheme where a cognition-based intervention using gaze data is applied. This paper presents the longitudinal evaluation of the proposed scheme in terms of security, memorability, and usability from a cognitive style perspective. Results strengthen the assumptions that understanding and using the inherent cognitive characteristics of users could enable the design of user-first authentication schemes, where no compromises need to be made on security for benefiting usability or the other way around.
  • Konferenzbeitrag
    Social Electricity: The evolution of a Large-Scale, Green ICT Social Application through two Case Studies in Cyprus and Singapore
    (EnviroInfo & ICT4S, Conference Proceedings, 2015) Kamilaris, Andreas; Pitsillides, Andreas; Fidas, Christos; Kondepudi, Sekhar
    Numerous green online social applications have emerged in recent years, aiming to motivate citizens towards pro environmental behavior. These applications exploit emerging new technologies, such as mobile computing, online social networking and the web, in order to affect their users in their everyday lives. In this paper, we discuss our experiences from the three year development and management of Social Electricity, a largescale green online social application which targets influencing people to reduce their electricity footprint. We provide findings from two case studies performed in Cyprus and Singapore for six months, involving 198 and 175 participants respectively. Through these studies, we observed the acceptance, effectiveness and potential of Social Electricity, increasing our knowledge about the motivations that inspire people to take pro-environmental actions and the barriers that hinder them from acting in a sustainable way. Finally, we present the new version of Social Electricity, supporting citizens from all around Europe, carefully designed and developed based on the feedback received from these case studies and the accumulated expertise during these three years.