Masakatu Morii received his Ph.D.in Communication Engineering from Osaka University, 1989. From 1989 to 1990, he was an Instructor in the Department of Electronics and Information Science, Kyoto Institute of Technology, Japan. From 1990 to 1995, he was an Associate Professor in the Department of Computer Science, Faculty of Engineering at Ehime University, Japan. From 1995 to 2005, he was a Professor in the Department of Intelligent Systems and Information Science, Faculty of Engineering, at the University of Tokushima, Japan. Since 2005, he has been a Professor in the Department of Electrical and Electronics Engineering, Faculty of Engineering, at Kobe University, Japan. His research interests include cyber security, cryptography, discrete mathematics, and information theory. He is a fellow of The Institute of Electronics, Information and Communication Engineers, Japan.