1. Department of Information Security, College of Signals, National University of Sciences and Technology (NUST), Rawalpindi, Pakistan
2. School of Electrical Engineering and Computer Science (SEECS), National University of Sciences and Technology (NUST), Islamabad, Pakistan
3. School of Mathematics, Computer Science and Engineering, City, University of London, U.K.
4. School of Computer Science and Informatics, Cardiff University, Cardiff, U.K.