KDDI R&D Laboratories, Inc., founded in 1998, is a R&D centre of KDDI Group. It has over 280 highly qualified employees at 3 locations in Japan, and supports the KDDI Group's brand promise ``Designing The Future'', with leading-edge technologies. KDDI is a comprehensive communications company offering both fixed-line and mobile communications services, KDDI R&D Laboratories Inc. is promoting research and development in the following comprehensive areas: Access and Core Network, Network Operation and Administration, Cloud Computing, Security, Multimedia, Human Communication. The security is the one of main research interests. We cover very wide area of information security: cryptographic primitives, security protocols, software security and privacy. We have experience in the security consultations and designing commercial products.