1. Department of Electronic Systems; Aalborg University; Aalborg Denmark
2. Institute of Telecommunications; University of Technology and Life Sciences in Bydgoszcz; Bydgoszcz Poland
3. Computer Networks and Security Laboratory; Universidade Estadual do Ceará; Fortaleza Ceará Brazil
4. Center for Software Technology and Management, Faculty of Information Science and Technology; Universiti Kebangsaan Malaysia; Bangi Selangor Malaysia