1. First, check the signature verification server dn of Kim Jong Kook Xin in Internet Explorer. On the menu of Internet Explorer, click Internet Options on the Tools menu. Select the Content tab and click the Certificates button to view a list of current certificates that readers trust.

2. Secondly, click the "Personal" tab to view the applied personal digital certificate, and select the personal digital certificate to view.

3. Finally, click the View button to view the details of the certificate.