• Conference Object  

      IHIP: Towards a user centric Individual Human Interaction Proof framework 

      Fidas, Christos A.; Hussmann, H.; Belk, Marios; Samaras, George S. (Association for Computing Machinery, 2015)
      A Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a widely used Human Interaction Proof mechanism to protect on-line services against automated software agents. Nowadays, there is a ...
    • Article  

      A personalized user authentication approach based on individual differences in information processing 

      Belk, Marios; Fidas, Christos A.; Germanakos, Panagiotis; Samaras, George S. (2015)
      An effective user authentication mechanism should embrace both security and usability aspects as its purpose is to ensure safety of operation of online services but as well usability and transparency to its end users. In ...
    • Conference Object  

      Security and usability in knowledge-based user authentication: A review 

      Katsini, Christina P.; Belk, Marios; Fidas, Christos A.; Avouris, Nikolaos M.; Samaras, George S. (Association for Computing Machinery, 2016)
      This paper presents a comprehensive review of state-of-the-art research works in knowledge-based user authentication, covering the security and usability aspects of the most prominent user authentication schemes