1. School of Information Technology & Mathematical Sciences; University of South Australia; Adelaide SA 5095 Australia
2. Department of Informatics; Telkom University; Bandung Indonesia
3. Department of Information Systems and Cyber Security; The University of Texas at San Antonio; San Antonio TX 78249-0631 USA
4. Information Security interest group (ISIG); Faculty of Computer Science and Information Technology; Universiti Tun Hussein Onn Malaysia; Batu Pahat Johor Malaysia