Koji Nakao received the B.E. degree of Mathematics from Waseda University, in Japan, in 1979. Since joining KDDI in 1979, Koji has been engaged in the research on communication protocol, and information security technology for telecommunications in KDDI laboratory. He has started to additionally work for NICT (National Institute of Information and Communications Technology) in 2004 and for Yokohama National University as a guest professor in 2015. Since 2000, he has been conducted for governmental security research projects and involved in International Security Standardization activities. His present positions are "Distinguished Researcher" to manage research activities for network security technologies in NICT and Guest Professor of Yokohama National University. He is a member of IPJS and a follow of IEICE. Koji has also been Security Advisor for CABINET SECRETARIAT of Japanese Government since 2017.