Wildcard SSL Certificates

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A wildcard SSL certificate is a type of digital certificate that secures a domain and all its subdomains with a single certificate. It allows for secure communication over HTTPS (Hypertext Transfer Protocol Secure) by encrypting the data transmitted between a web server and a user’s browser.

Typically, an SSL certificate is issued for a specific domain name (e.g., www.example.com), and it only secures that particular domain. However, a wildcard SSL certificate expands the coverage to all subdomains of a specific domain. The subdomains can be dynamically created without the need to obtain and manage separate SSL certificates for each subdomain.

The wildcard character () is used as a placeholder in the certificate’s common name (CN) field, representing any subdomain of the base domain. For example, a wildcard SSL certificate issued for « .example.com » would secure subdomains like « mail.example.com, » « blog.example.com, » « shop.example.com, » and so on.

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