Wildcardsertifikaatti

Wildcardsertifikaatti, also known as a wildcard certificate, is a type of public key certificate that uses a single certificate to secure multiple subdomains of a domain. This is in contrast to traditional certificates, which are issued for a single domain name. The wildcard certificate is identified by an asterisk (*) in the domain name field of the certificate, which represents any subdomain. For example, a wildcard certificate for example.com would secure www.example.com, blog.example.com, and any other subdomain of example.com.

Wildcard certificates are commonly used by organizations that host multiple subdomains under a single domain. They provide a cost-effective solution for securing a large number of subdomains with a single certificate. However, they have some limitations. They do not secure the base domain itself, so a separate certificate is needed for example.com. Additionally, they do not secure subdomains of subdomains, so a separate certificate would be needed for sub.sub.example.com.

Wildcard certificates are issued by Certificate Authorities (CAs) and can be used with various types of web servers and applications that support SSL/TLS. They are typically used in conjunction with a private key to establish a secure connection between a client and a server. The process of obtaining a wildcard certificate involves verifying the ownership of the domain and the subdomains, and then generating the certificate and installing it on the server.