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Using a Wildcard Certificate: How Does It Work?
If you see yourself using multiple subdomains in the future, investing in a Wildcard SSL Certificate today can save you money in the long run - as you wouldn't have to buy multiple certificates later on - and provide you with a comprehensive management option for all of your subdomains.
Single-domain Wildcard SSL Certificates can only secure subdomains on a single domain level. So if you need to safe-keep multiple levels of subdomains, you'll need to get a Multi-Domain Wildcard SSL or a Business SSL under GeoTrust, Thawte or DigiCert. These Multi-Domain Certificates allow you to secure multiple sub-domain levels with just one Wildcard Certificate, saving you even more money.
|RSA or ECC
|Minimum Key Size
|2048-bit (RSA), 233-bit (ECC)