─ 43 ─Biographical Sketches of AuthorsNaoya OKAWA is currently an undergraduate student in the Department of Mathematical Information Engineering, College of Industrial Technology, Nihon University. His research interests include information security.Kouya TOCHIKUBO received his B. S. degree from Tokyo University of Science, his M. S. degree from Japan Advanced Institute of Science and Technology (JAIST), and his D. E. degree from Tokyo Institute of Technology in 1996, 1998 and 2004, respectively. He joined the Systems Integration Technology Center, Toshiba Corporation in 1998. Currently, he is an associate professor in the Department of Mathematical Information Engineering, College of Industrial Technology, Nihon University. He was a visiting professor at the University of Waterloo from 2012 to 2013. Dr. Tochikubo received the SCIS Paper Award and the Institute of Electronics, Information and Communication Engineers (IEICE) Best Paper Award in 2002 and 2005, respectively.
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