Development of Secure QR Code by Using Invisible Information Display Lighting Device

Recently, about 70% of people in the world have smart phones [1]. In the case of Japan, it reaches about 90% penetration [1]. According to this situation, smart phone usage extends beyond Internet access. Many users often take photos by using advanced cameras and utilizing QR code payments. On the other hand, QR code has a serious vulnerability, such as replication and forgery. To overcome this problem, the flicker QR code has been proposed as a novel implementation approach. Flicker noise is invisible to human eyes and is captured by smart phone cameras. Thus, this code can aim to enhance security capability for payments. It was found that a secure flicker QR code was realized at a blinking frequency of 120 Hz, shutter speed of 800 ps, and measured distance of 100 cm.