How to create a Digicert.cer

Instructions
1. Open the YOUR.cer certificate.


2. Click on the Certification Path tab and highlight DigiCert. Click on View Certificate.

3. In the Details tab, click on Copy to File.


4. The Certificate Export Wizard appears. Click Next.


5. Select the default ‘DER encoded binary X.509 (.CER)’ option. Click Next.


6. Specify a file name and a location to export the certificate to. Click Next.


7. Click Finish to complete the Export Wizard. The digicert.cer certificate is created in the specified directory.

8. Run the following commands using SharePoint 2010 Management Shell to add the trusted root authority.
$root = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2("c:\temp\digicert.cer")
New-SPTrustedRootAuthority -Name "YOUR Token Signing Root Authority" -Certificate $root