Rintaro Koike Rintaro Koike is a security analyst at NTT Security (Japan) KK. In addition, he is the founder of 'nao_sec' and a malicious traffic/script/document analyst. He was a speaker at the Japan Security Analyst Conference 2018/19 hosted by JPCERT/CC and has spoken at SECCON 2018 Conference, HITCON Community 2019 and Black Hat USA 2018 Arsenal.