All of the Certificate Authorities (CAs) that we carry are leaders in the industry and trusted across the world. Symantec is the largest CA in the world, and their Norton Trust Seal is the most recognized symbol of trust across the web. Their name definitely adds the most value of any CA in the industry. Additionally, GeoTrust, Thawte, RapidSSL, Certum, and Comodo are all trusted and secure CAs.