System.Security 2.0.0.0 4.0.0.0 System.Object To be added. The class defines the type of the identifier of a subject, such as a or a . The subject can be identified by the certificate issuer and serial number, the hash of the subject key, or the subject key. Property 2.0.0.0 4.0.0.0 System.Security.Cryptography.Pkcs.SubjectIdentifierOrKeyType To be added. To be added. The property retrieves the type of subject identifier or key. The subject can be identified by the certificate issuer and serial number, the hash of the subject key, or the subject key. Property 2.0.0.0 4.0.0.0 System.Object To be added. To be added. The property retrieves the value of the subject identifier or key. Use the property to determine the type of subject identifier or key, and use the property to retrieve the corresponding value.