The development of ICT(Information and Communication Technologies) has driven the growth and development of IT services industry. Industrial environment has gradually transformed to be based on mobile device, therefore, has been dependent on mobile platform. As a result, multiple vulnerabilities and attacks on mobile platform has increased. It is now inevitable requirement to protect client’s private data from various security risks. We’ve continuously provided various solutions, such as mobile platform protection, framework of a secure corporate network, and security consulting (penetration test) in order to help customers fulfill these obligations. We will do our best to provide a secure business environment as a mobile network security expert group. Our work area is as follow: • Cryptography and PKI systems development, network-related security system development • Security and system development for mobile platforms • Distributed processing-based system integration business