1. Get a pdf certificate: We need to apply for the corresponding certificate from CA (Digital Certificate Authority). After successful application, you will get a pdf digital certificate signature compressed package with a password. You can see the corresponding pdf digital certificate by decompressing the file.

2. Install the pdf certificate: Open the console program, select the certificate from the list of available independent management in the menu file, right-click and select Import in all tasks. According to the certificate import prompt, import. The pfx file obtained in the first step becomes "automatically select storage area according to certificate content". The installation of pdf certificate has been completed.

3. Deploy a pdf certificate: open the pdf file where the digital certificate needs to be deployed, select the certificate option in the menu tool, find the downloaded digital certificate, and then click the digital signature;

4. Complete the pdf certificate: upload the digital certificate, enter the password in the settings navigation window that pops up in the digital certificate, and complete the deployment of the pdf digital signature certificate;

5. Check the pdf certificate: Open the pdf file signed by the deployment digital certificate. Whether using Adobe Reader or Adobe Acrobat, "Signed and all signatures are valid" will be displayed. Click the signature area, and the name of the signing company and the time when the local certificate was signed will be displayed.

Solution: ssldun installs https certificate.