A trusted ticket is a one-time-use token that grants access to a particular Tableau dashboard using a web browser. Once a user has a ticket, he/she has a fixed amount of time to redeem that ticket (three minutes by default). There is no need to keep the ticket secret during or after use since a Tableau trusted ticket cannot be reused. Tableau Server must be configured to allow a particular server (or set of servers) to generate tickets on its behalf. These server(s) are sometimes referred to as Ticket Brokers and are whitelisted on Tableau Server (hence the trusted part).