System.Security.Cryptography.Pkcs.SubjectIdentifierType
The SubjectIdentifierType enumeration defines the type of subject identifier.
The subject is identified by the certificate issuer and serial number.
NoSignature = 3
The subject is identified as taking part in an integrity check operation that uses only a hashing algorithm.
The subject is identified by the hash of the subject's public key. The hash algorithm used is determined by the signature algorithm suite in the subject's certificate.
Unknown = 0
The type of subject identifier is unknown.