Authenticity has great salience in our times because new information and communication technologies have greatly expanded the scale and scope of the inauthentic. For example, they have made identity fraud possible and also playful; many of us now have multiple personalities online.When it is easy to choose an identity, what does that imply for the underlying reality? How do I know who I am, and how do you know who I am, and how does my bank know who I am?