VIArmour exclusively patented product---VDun, is a smart card, similar in appearance to SIM cards. Each VDun can be embedded with many secure digital certificates, making them unique and identifiable carriers that can be placed into the mobile phone via the SIM card. This increases the security of business transactions when using mobile applications. VDun is a technologically secured product, using the PKI (Public Key Infrastructure) system to ensure secure protection, as well as simplify the operation of complex apps. With the internet, it provides great authentication and secure encryption anytime, anywhere to satisfy your needs.