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Some of the most common RDNs and their explanations are as follows: CN : CommonName. OU : OrganizationalUnit. O : Organization.

Subject is the certificate's common name and is a critical property for the certificate in a lot of cases if it's a server certificate and clients are looking for a positive identification. As an example on an SSL certificate for a web site the subject would be the domain name of the web site.

Certificate contains this information Version and serial number. Information about the issuer: country, state, city, organization, organization unit common name, email. Validity: not before date, not after date. Information about the the subject: country, state, city, organization, organization unit, common name, email.

The Common Name is technically represented by the commonName field in the X. 509 certificate specification. In the case of a single-name certificate, the Common Name consists of a single host name (e.g. example.com , .example.com ), or a wildcard name in the case of a wildcard certificate (e.g. *. example.com ).

A Subject Key Identifier (SKI) is just a digest of the Subject Public Key. A Thumbprint is a digest of the entire certificate. The SKI is used to validate certificate chains. The thumbprint is used to see if a certificate has been altered.

Share to Facebook Share to Twitter. Definitions: The entity authorized to use the private key associated with the public key in the certificate.

Certificate contains this information Version and serial number. Information about the issuer: country, state, city, organization, organization unit common name, email. Validity: not before date, not after date. Information about the the subject: country, state, city, organization, organization unit, common name, email.

The Subject field of the certificate must identify the primary hostname of the server as the Common Name. A certificate may be valid for multiple hostnames (e.g., a domain and its subdomains).