Specifies whether to include a detached signature when signing a message.
This property specifies whether the Sign operation products a message that includes both a signature and the message data, or just a signature.
When set to False default the output message holds the data and signature in one CMS message. This may be passed in its entirety to the receiving party for signature verification.
When set to True the output message holds only a signature in the CMS message. Both the original input data and the signature in the output message produced by the Sign operation must be passed to the receiving party for signature verification.