In order to cope with cyber-attacks which had been continuously growing in sophistication, in 2011, in the Cyber Security Laboratories, we started our studies on cyber-security technologies, constructing the world most advanced technology-infrastructure that enables the observations, analyses, counter-measures, and prevention of cyber-attacks: as the abovementioned example shows, for the purpose of contributing to the solution-provision of social issues, we have been conducting the activities on cyber-security research and development by taking practical approaches. In 2013, under the Cyber-Attack Counter-Measure Research Center, Cyber-Attack ProtectionTactics Research Laboratory and Cyber-Attack Detection and Analysis Laboratory were established. Their missions are to conduct the studies for the establishment of cyber-attack protection tactics which are derived from the fundamental studies on cyber-attack mechanisms and the studies on the recreation of attacks-of course safely-for attack-evaluation and test. In this article, we show the overview of NICT’s research and development activities on the cyber-security technologies conducted during the five years from FY2011 that were conducted following the 3rd Medium- to Long-Term Plan.