These words all share a common root, which implies an “enlarger, founder, master, leader,” literally “one who causes to grow,” agent noun from auctus, pp. of augere “to increase”.
Being an author indicates that you are fundamentally creative.
Authenticity is about being “original, genuine, principal” from authentes “one acting on one’s own authority,” from autos “self” + hentes “doer, being.” It’s all about creating yourself, in a sense.
We’re told, as children, to respect authority, to trust in it and to obey it. Well those are all misplaced, when the authority, the “enlarger, founder, master, leader”, acts in destructive or deceptive ways. When they are no longer genuine they are no longer authentic.
So I claim that if the authorities are not creative and genuine, but are instead destructive and deceptive, the deal is off. They have relinquished the title by their acts. You are not obliged to respect, trust and obey such people.
I love playing with words 🙂