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Jan 29, 2024 · In every X.509 certificate, there’s a common name (CN) attribute. This attribute tells the certificate receiver the name of the entity that owns the public key in the certificate. Besides that, there’s an X.509 extension, subject alternative names (SAN), that stores other identifiers.
Assuming the Subject Alternative Name (SAN) property of an SSL certificate contains two DNS names. domain.example; host.domain.example; but the Common Name (CN) is set to only one of both: CN=domain.example. Does this setup have a special meaning, or any [dis]advantages over setting both CNs?
When a certificate, or an identity extracted from a certificate, is "shown" to a human user, the Common Name will figure proeminently. For instance, if using smart card logon on a Windows system, then the logon screen will show the Common Name in big letters when the smart card is inserted.
Sep 5, 2023 · The SSL certificate common name is an important component of website security. It is used to verify domain ownership and prevent unauthorized access. Choosing the right common name and regularly updating SSL certificates is essential for optimal website security.
The common name is the domain name you wish to secure with your certificate. If you are creating a single domain certificate, entering the common name is straightforward: it is the single domain you wish to secure. Don’t forget to include the subdomain if your single address includes a subdomain.
Single vs Multi names. You can associate the host names to an SSL certificate using two different attributes: the Common Name. the Subject Alternative Name (SAN) The Common Name allows specifying a single entry (either a wildcard or single-name), whereas the SAN extension supports multiple entries.
An SSL certificate (more accurately called a TLS certificate), is necessary for a website to have HTTPS encryption. An SSL certificate contains the website's public key, the domain name it's issued for, the issuing certificate authority's digital signature, and other important information.
