• ASPIDA: A client-oriented platform for assessing websites security practices adoption and reward 

      Vlachos V., Katsidimas I., Kerimakis E., Nikoletseas S., Panagiotou S., Spirakis P. (2021)
      The adoption of good security practices for the e-commerce business is a challenging problem. The enforcement of a strict legal framework is not always effective. On the other hand, simple recommendations and raising ...
    • ASPIDA: An Observatory for Security and Privacy in the Greek e-Business Sector 

      Vlachos V., Katevas G., Katsidimas I., Kerimakis E., Nikoletseas S., Panagiotou S., Spirakis P. (2021)
      Modern e-business policy aims to better frame and steer progress and advancements towards a legal and security aware framework. However, a large percentage of cases neglects the adoption of good security practices, exposing ...
    • Defeasible reasoning with e-contracts 

      Giannikis, G. K.; Daskalopulu, A. (2007)
      We propose a mapping from a contract representation in Event Calculus to Default Logic. The resulting representation allows for defeasible reasoning with e-contracts, which is useful in order to determine the normative ...
    • The economic notion of trust 

      Tsiakis, T. (2010)
      It is apprehended that the human element of trust is becoming the number one asset for the financial organisations. And since trust is a matter of relationships, financial organisations need to create, expand and maintain ...
    • Facebook social support: A comparative study on depression and personality characteristics 

      Giota, K. G.; Kleftaras, G. (2013)
      The explosive growth of Social Networking Sites such as Facebook had a huge impact on psychological research. One of the most controversial questions regards to whether online relationships provide meaningful social support. ...
    • How can agents know what to assume when? 

      Giannikis, G. K.; Daskalopulu, A. (2008)
      The work in this paper is motivated from the need for assumption-based reasoning in normative systems, where, realistically, agents will have incomplete knowledge about their environment, and about other agents. The question ...
    • The representation of e-contracts as default theories 

      Giannikis, G. K.; Daskalopulu, A. (2007)
      It is widely acknowledged that a temporal representation of e-contracts is essential in order to support e-contract execution and performance monitoring. One possibility that has been explored by many researchers is to ...
    • Simple Mail Delivery Protocol: Recipient-based email delivery with anti-spam support 

      Zisiadis, D.; Kopsidas, S.; Tassiulas, L. (2013)
      In this paper we propose a user based architecture for the email system, where the recipient of an email message manage its receipt in conjunction with both origin and destination email servers. Messages are kept to the ...
    • What makes a web site 

      Kavassalis, P.; Lelis, S.; Rafea, M.; Haridi, S. (2004)
      Several factors which affect the popularity of the web sites are discussed. A computational model involving two superimposed interaction networks with random connections is developed which links the sites as well as organizes ...