Ali Ismail Awad is an Associate Professor in the Department of Computer Science, Electrical and Space Engineering, Lulea University of Technology, Sweden. He is also an Assistant Professor in the Electrical Engineering Department, Faculty of Engineering, Al Azhar University, Qena, Egypt. He is an IEEE Senior Member, and his research interests include information security, with a focus on biometrics, pattern recognition and computer networks. Michael Fairhurst is Professor of Computer Vision in the School of Engineering and Digital Arts at the University of Kent, UK. His research interests have a focus on the fundamental processes of image analysis and pattern recognition, with particular emphasis on applications in security and, especially, biometrics, and he is a Fellow of the IAPR. He is Editor-in-Chief of the IET Biometrics Journal and Series Editor of the IET Book Series on Advances in Biometrics.