X.509 certificate-based adult authentication

Development of information and communication technologies has allowed us to use a high-speed internet, anytime and anywhere. As a result, ease of access to a variety of digital content, such as images, sound, and text, improves our quality of life quite significantly. But, most digital content sites lack a mechanism to block the access to minors. So, almost minors who use internet can easily access to harmful sexual material. This results in serious damages to society. Based on the understanding that there are few mechanisms to screen out minors from accessing inappropriate content available on the market, this paper suggests an approach whereby a confirmation of age of a user, using a X.509 certificate of electronic signature is applied when the user attempts to access certain material.