Being able to decrypt the OWIN AuthenticationTicket can be very useful. In the cases where the cookie/tickets are shared across applications, this is especially true.
Interestingly, if you’re using OWIN for both cookie-based authentication and access tokens, the Ticket is stored in both mediums.
With that in mind, the easiest method to decrypt a ticket to access claims, etc is to simply stand up a protected Resource server with a single Api endpoint to display the contents of the ticket. Going this route, the decryption is automatically handled by OWIN with very little code. The endpoint can be accessed by a user’s browser (decrypting the cookie) or by a server passing in a Bearer token.
More Link