Knowledge Base

If you have already collected the certificate on your computer, first you need to export it into a PFX/P12 format. 

When doing this, make sure you export the private key.  

Include all certificates in the certificate path if possible.  

You must also specify a strong password to protect the certificate file. 

Once exported, you can email the certificate file to your Android device or transfer it in some other manner  

(for example, copy to a USB drive or upload then download from online storage). 

Open the PFX/P12 file from your Android Device. 

Enter your password to extract your certificate 

Upon clicking the Download button, an “Extract Certificate” pop-up window will appear requiring you to enter the password you have created. Type in your password then click the OK button. 

Step 1: Choose your certificate type 

After clicking the OK button, you will be given two download options for your S/MIME certificate: VPN & app user certificate or Wi-Fi certificate. Choose VPN & app user certificate for the type of your certificate then click the OK button.

Step 2: Place a name for your certificate 

A default name will be assigned to the certificate, consisting of a long string of letters and numbers. You can choose to change the name to one that you can easily remember.

Step 3: A message will appear saying that your S/MIME certificate has been installed on your Android device 

Once you confirm the name for your certificate and click the OK button, you will see the message: User certificate installed. You can now proceed to check the S/MIME certificate you have downloaded on your phone.

Step 4: Check the Security settings of your Android phone 

Go to Settings and click Security 

Next, click Encryption & Credentials

Click User credentials

Click on the S/MIME certificate you have installed to check its details.

Since it has been downloaded as a PFX file, you will see that your certificate contains your user key/private key, your actual certificate, and the CA certificate which assures your device that your certificate can be trusted.

For further assistance or troubleshooting, you can refer to Sectigo’s official Knowledge Base or contact support.