This read-only property contains identifiers of certificates which were used to sign the message.
Use this property to get identifiers of certificates which were used for message signing.
Identifier represents an <Issuer, SerialNumber> pair.
Note, you may access this property even if the verification process failed (when no appropriate certificate was found in the certificate storage or CertStorage property was set to null (nil, Nothing)). Also, you may browse this property after successful execution of this routine to identify the certificate which was used to verify the message.