Thanks for that; I think I actually understand some of it.

com.apple.sytemdefault, a key, is ID'd as a "Self-signed root certificate" and can encrypt, verify, and wrap.

Dashboard Advisory is a certificate. (It seems to be Apple generated, so I wonder why it "was signed by an unknown authority?")

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire